diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.Common/HttpResponseHelper.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.Common/HttpResponseHelper.cs
index 4dacde5..ac9c885 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.Common/HttpResponseHelper.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.Common/HttpResponseHelper.cs
@@ -44,7 +44,7 @@ public static Dictionary<HttpStatusCode, string> StatusCodeDescriptors
 
         public static string ResponseString(HttpStatusCode statusCode, string content)
         {
-            var contentType = statusCode == HttpStatusCode.BadRequest ? PlainTextContentType : JsonContentType;
+            var contentType = IsClientError((int)statusCode) ? PlainTextContentType : JsonContentType;
 
             string statusDescription;
             StatusCodeDescriptors.TryGetValue(statusCode, out statusDescription);
@@ -59,6 +59,11 @@ public static string ResponseString(HttpStatusCode statusCode, string content)
             return responseString.ToString();
         }
 
+        public static bool IsClientError(int code)
+        {
+            return code >= 400 && code < 500;
+        }
+
         #endregion
     }
 }
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/AlertCommand.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/AlertCommand.cs
index 2e8c802..b2d540c 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/AlertCommand.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/AlertCommand.cs
@@ -56,7 +56,7 @@ public override string DoImpl()
                 }
 
                 invokeProv.Invoke();
-                return null;
+                return this.JsonResponse();
             }
 
             throw new AutomationException("No alert is displayed", ResponseStatus.NoAlertOpenError);
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/CommandBase.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/CommandBase.cs
index 3f5ee0d..96fe773 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/CommandBase.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/CommandBase.cs
@@ -84,6 +84,14 @@ public virtual string DoImpl()
             throw new NotImplementedException();
         }
 
+        /// <summary>
+        /// The JsonResponse with SUCCESS status and NULL value.
+        /// </summary>
+        public string JsonResponse()
+        {
+            return JsonConvert.SerializeObject(new JsonResponse(this.Session, ResponseStatus.Success, null));
+        }
+
         public string JsonResponse(ResponseStatus status, object value)
         {
             if (status != ResponseStatus.Success && value == null)
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ExecuteCommand.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ExecuteCommand.cs
index 88d68ff..a820b57 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ExecuteCommand.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ExecuteCommand.cs
@@ -70,7 +70,7 @@ public override string DoImpl()
                     throw new AutomationException(msg, ResponseStatus.JavaScriptError);
             }
 
-            return this.JsonResponse(ResponseStatus.Success, string.Empty);
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/GetElementAttributeCommand.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/GetElementAttributeCommand.cs
index d93de50..368fd32 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/GetElementAttributeCommand.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/GetElementAttributeCommand.cs
@@ -32,7 +32,7 @@ public override string DoImpl()
 
             if (attributeName == null)
             {
-                return this.JsonResponse(ResponseStatus.Success, null);
+                return this.JsonResponse();
             }
 
             /* GetAttribute command should return: null if no property was found,
@@ -47,7 +47,7 @@ public override string DoImpl()
             }
             catch (AutomationException)
             {
-                return this.JsonResponse(ResponseStatus.Success, null);
+                return this.JsonResponse();
             }
         }
 
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ScreenCoordinatesHelper.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/Helpers/ScreenCoordinatesHelper.cs
similarity index 97%
rename from WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ScreenCoordinatesHelper.cs
rename to WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/Helpers/ScreenCoordinatesHelper.cs
index 32e9207..2ee195a 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ScreenCoordinatesHelper.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/Helpers/ScreenCoordinatesHelper.cs
@@ -1,4 +1,4 @@
-namespace WindowsUniversalAppDriver.InnerServer.Commands
+namespace WindowsUniversalAppDriver.InnerServer.Commands.Helpers
 {
     using System;
     using System.Reflection;
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ValueCommand.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ValueCommand.cs
index 7b841a2..d32e9db 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ValueCommand.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/Commands/ValueCommand.cs
@@ -30,7 +30,7 @@ public override string DoImpl()
             }
 
             TrySetText(textbox, this.KeyString);
-            return this.JsonResponse(ResponseStatus.Success, null);
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/WindowsUniversalAppDriver.InnerServer.csproj b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/WindowsUniversalAppDriver.InnerServer.csproj
index 811a063..39da78d 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/WindowsUniversalAppDriver.InnerServer.csproj
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver.InnerServer/WindowsUniversalAppDriver.InnerServer.csproj
@@ -67,7 +67,7 @@
     <Compile Include="Commands\LocationInViewCommand.cs" />
     <Compile Include="Commands\OrientationCommand.cs" />
     <Compile Include="Commands\PageSourceCommand.cs" />
-    <Compile Include="Commands\ScreenCoordinatesHelper.cs" />
+    <Compile Include="Commands\Helpers\ScreenCoordinatesHelper.cs" />
     <Compile Include="Commands\GetElementTagNameCommand.cs" />
     <Compile Include="Commands\TextCommand.cs" />
     <Compile Include="Commands\ValueCommand.cs" />
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ClickElementExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ClickElementExecutor.cs
index b0a1e7d..69b824e 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ClickElementExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ClickElementExecutor.cs
@@ -18,7 +18,7 @@ protected override string DoImpl()
 
             this.Automator.EmulatorController.LeftButtonClick(location.Value);
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CloseExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CloseExecutor.cs
index caab948..4520570 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CloseExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CloseExecutor.cs
@@ -8,7 +8,7 @@ protected override string DoImpl()
         {
             this.Automator.Deployer.Uninstall();
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CommandExecutorBase.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CommandExecutorBase.cs
index dc95977..bdef2f2 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CommandExecutorBase.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/CommandExecutorBase.cs
@@ -51,7 +51,9 @@ public string Do()
             }
             catch (NotImplementedException exception)
             {
-                return HttpResponseHelper.ResponseString(HttpStatusCode.NotImplemented, exception.Message);
+                return HttpResponseHelper.ResponseString(
+                    HttpStatusCode.NotImplemented,
+                    this.JsonResponse(ResponseStatus.UnknownCommand, exception.Message));
             }
             catch (Exception exception)
             {
@@ -70,6 +72,14 @@ protected virtual string DoImpl()
             throw new InvalidOperationException("DoImpl should never be called in CommandExecutorBase");
         }
 
+        /// <summary>
+        /// The JsonResponse with SUCCESS status and NULL value.
+        /// </summary>
+        protected string JsonResponse()
+        {
+            return this.JsonResponse(ResponseStatus.Success, null);
+        }
+
         protected string JsonResponse(ResponseStatus status, object value)
         {
             return JsonConvert.SerializeObject(new JsonResponse(this.Automator.Session, status, value));
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ExecuteScriptExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ExecuteScriptExecutor.cs
index 2482b89..539f7ef 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ExecuteScriptExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ExecuteScriptExecutor.cs
@@ -43,7 +43,7 @@ protected override string DoImpl()
                     break;
             }
 
-            return null;
+            return this.JsonResponse();
         }
         
         internal void ExecuteMobileScript(string command)
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GetCurrentWindowHandleExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GetCurrentWindowHandleExecutor.cs
index cab9c25..b39d640 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GetCurrentWindowHandleExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GetCurrentWindowHandleExecutor.cs
@@ -1,5 +1,11 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
+    using WindowsUniversalAppDriver.Common;
+
+    #endregion
+
     internal class GetCurrentWindowHandleExecutor : CommandExecutorBase
     {
         #region Methods
@@ -7,7 +13,7 @@ internal class GetCurrentWindowHandleExecutor : CommandExecutorBase
         protected override string DoImpl()
         {
             // TODO: There is only one window for windows phone app, so it must be OK, or not?
-            return "current";
+            return this.JsonResponse(ResponseStatus.Success, "current");
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GoBackExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GoBackExecutor.cs
index b212e71..9fb22c0 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GoBackExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/GoBackExecutor.cs
@@ -1,7 +1,11 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
     using System.Windows.Forms;
 
+    #endregion
+
     internal class GoBackExecutor : CommandExecutorBase
     {
         #region Methods
@@ -11,7 +15,7 @@ protected override string DoImpl()
             // F1 is shortcut for "Back" hardware button
             this.Automator.EmulatorController.TypeKey(Keys.F1);
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseClickExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseClickExecutor.cs
index 4e00cf2..9930c5b 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseClickExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseClickExecutor.cs
@@ -8,7 +8,7 @@ protected override string DoImpl()
         {
             this.Automator.EmulatorController.LeftButtonClick();
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseDownExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseDownExecutor.cs
index 2534e68..ea84472 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseDownExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseDownExecutor.cs
@@ -8,7 +8,7 @@ protected override string DoImpl()
         {
             this.Automator.EmulatorController.LeftButtonDown();
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseMoveToExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseMoveToExecutor.cs
index a7af78e..c40e4b3 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseMoveToExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseMoveToExecutor.cs
@@ -1,11 +1,15 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
     using System;
     using System.Drawing;
     using System.Globalization;
 
     using WindowsUniversalAppDriver.Automator;
 
+    #endregion
+
     internal class MouseMoveToExecutor : CommandExecutorBase
     {
         #region Methods
@@ -30,7 +34,7 @@ protected override string DoImpl()
             this.Automator.UpdatedOrientationForEmulatorController();
             this.Automator.EmulatorController.MoveCursorTo(coordinates);
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseUpExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseUpExecutor.cs
index 8dabd72..34fafdf 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseUpExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/MouseUpExecutor.cs
@@ -8,7 +8,7 @@ protected override string DoImpl()
         {
             this.Automator.EmulatorController.LeftButtonUp();
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/NewSessionExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/NewSessionExecutor.cs
index 8a6140d..fefc1ae 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/NewSessionExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/NewSessionExecutor.cs
@@ -61,9 +61,7 @@ protected override string DoImpl()
             // Gives sometime to load visuals (needed only in case of slow emulation)
             Thread.Sleep(this.Automator.ActualCapabilities.LaunchDelay);
 
-            var jsonResponse = this.JsonResponse(ResponseStatus.Success, this.Automator.ActualCapabilities);
-
-            return jsonResponse;
+            return this.JsonResponse(ResponseStatus.Success, this.Automator.ActualCapabilities);
         }
 
         private EmulatorController CreateEmulatorController(bool withFallback)
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ScreenshotExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ScreenshotExecutor.cs
index 87a8c72..9aa4992 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ScreenshotExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/ScreenshotExecutor.cs
@@ -1,12 +1,15 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    using WindowsUniversalAppDriver.Common;
+
     internal class ScreenshotExecutor : CommandExecutorBase
     {
         #region Methods
 
         protected override string DoImpl()
         {
-            return this.Automator.EmulatorController.TakeScreenshot();
+            var base64Screenshot = this.Automator.EmulatorController.TakeScreenshot();
+            return this.JsonResponse(ResponseStatus.Success, base64Screenshot);
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/SendKeysToElementExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/SendKeysToElementExecutor.cs
index 5f91b14..6ac5458 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/SendKeysToElementExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/SendKeysToElementExecutor.cs
@@ -1,9 +1,13 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
     using System.Collections.Generic;
     using System.Linq;
     using System.Windows.Forms;
 
+    #endregion
+
     internal class SendKeysToElementExecutor : CommandExecutorBase
     {
         #region Methods
@@ -42,7 +46,7 @@ protected override string DoImpl()
                 this.Automator.EmulatorController.TypeKey(magicKey);
             }
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchFlickExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchFlickExecutor.cs
index ce64cf2..818e87f 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchFlickExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchFlickExecutor.cs
@@ -1,5 +1,7 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
     using System;
     using System.Drawing;
     using System.Globalization;
@@ -7,6 +9,8 @@
     using WindowsUniversalAppDriver.Automator;
     using WindowsUniversalAppDriver.EmulatorHelpers;
 
+    #endregion
+
     internal class TouchFlickExecutor : CommandExecutorBase
     {
         #region Methods
@@ -38,7 +42,7 @@ protected override string DoImpl()
                 this.Automator.EmulatorController.PerformGesture(new FlickGesture(startPoint, xSpeed, ySpeed));
             }
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchScrollExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchScrollExecutor.cs
index 0f12930..d18d6c6 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchScrollExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchScrollExecutor.cs
@@ -1,5 +1,7 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
     using System;
     using System.Drawing;
     using System.Globalization;
@@ -7,6 +9,8 @@
     using WindowsUniversalAppDriver.Automator;
     using WindowsUniversalAppDriver.EmulatorHelpers;
 
+    #endregion
+
     internal class TouchScrollExecutor : CommandExecutorBase
     {
         #region Methods
@@ -30,7 +34,7 @@ protected override string DoImpl()
 
             this.Automator.EmulatorController.PerformGesture(new ScrollGesture(startPoint, xOffset, yOffset));
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion
diff --git a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchSingleTapExecutor.cs b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchSingleTapExecutor.cs
index c7e933e..8dd015f 100644
--- a/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchSingleTapExecutor.cs
+++ b/WindowsUniversalAppDriver/WindowsUniversalAppDriver/CommandExecutors/TouchSingleTapExecutor.cs
@@ -1,8 +1,12 @@
 namespace WindowsUniversalAppDriver.CommandExecutors
 {
+    #region
+
     using WindowsUniversalAppDriver.Automator;
     using WindowsUniversalAppDriver.EmulatorHelpers;
 
+    #endregion
+
     internal class TouchSingleTapExecutor : CommandExecutorBase
     {
         #region Methods
@@ -14,13 +18,13 @@ protected override string DoImpl()
             var elementId = Automator.GetValue<string>(this.ExecutedCommand.Parameters, "element");
             if (elementId == null)
             {
-                return null;
+                return this.JsonResponse();
             }
 
             var tapPoint = this.Automator.RequestElementLocation(elementId).GetValueOrDefault();
             this.Automator.EmulatorController.PerformGesture(new TapGesture(tapPoint));
 
-            return null;
+            return this.JsonResponse();
         }
 
         #endregion