InvalidExtensionManifestException when installing omnisharp-vscode

[kevinchalet]

When installing omnisharp-vscode, the VSIX installer crashes with the following message:

Removing the "rc" modifier in the manifest file seems to work around this issue:

<Identity Language="en-US" Id="csharp" Version="1.0.3" Publisher="ms-vscode"/>

19/04/2016 03:09:14 - Microsoft VSIX Installer
19/04/2016 03:09:14 - -------------------------------------------
19/04/2016 03:09:14 - Initializing Install...
19/04/2016 03:09:14 - Microsoft.VisualStudio.ExtensionManager.InvalidExtensionManifestException: L'élément 'Identity' a une valeur non valide pour l'attribut 'Version' ---> System.FormatException: Le format de la chaîne d'entrée est incorrect.
   à System.Version.VersionResult.SetFailure(ParseFailureKind failure, String argument)
   à System.Version.TryParseComponent(String component, String componentName, VersionResult& result, Int32& parsedComponent)
   à System.Version.TryParseVersion(String version, VersionResult& result)
   à System.Version.Parse(String input)
   à System.Version..ctor(String version)
   à Microsoft.VisualStudio.ExtensionManager.ExtensionImpl.<>c.<ExtractManifestData>b__11_1(String s)
   à Microsoft.VisualStudio.ExtensionManager.ExtensionImpl.VerifyStringValue[T](String value, ErrorInfo info, Func`2 selector, Boolean isRequired, Int32 maxLength, T defaultValue)
   --- Fin de la trace de la pile d'exception interne ---
   à Microsoft.VisualStudio.ExtensionManager.ExtensionImpl.VerifyStringValue[T](String value, ErrorInfo info, Func`2 selector, Boolean isRequired, Int32 maxLength, T defaultValue)
   à Microsoft.VisualStudio.ExtensionManager.ExtensionImpl.ExtractManifestData(PackageManifest manifest)
   à Microsoft.VisualStudio.ExtensionManager.ExtensionImpl.ReadPackageManifest(XmlReader reader)
   à Microsoft.VisualStudio.ExtensionManager.ExtensionImpl.ReadManifest(Stream manifestStream, String localeRelativeRoot, Boolean localize)
   à Microsoft.VisualStudio.ExtensionManager.InstallableExtensionImpl.ReadVSIXManifestFromPackage(Stream vsixStream, CultureInfo preferredCulture)
   à Microsoft.VisualStudio.ExtensionManager.InstallableExtensionImpl..ctor(String path, CultureInfo preferredCulture)
   à VSIXInstaller.App.InitializeInstall(Boolean isRepairSupported)
   à VSIXInstaller.App.InitializeInstall()
   à System.Threading.Tasks.Task.InnerInvoke()
   à System.Threading.Tasks.Task.Execute()

Runtime Environment:
OS Name: Windows
OS Version: 6.1.7601
OS Platform: Windows
RID: win7-x64
Locale: French

[gregg-miskelly]

It sounds like you are trying to double click the .vsix. That isn't going to work as far as I know -- that would try and install the .vsix into Visual Studio. You want to File->Open it from VS Code.

[kevinchalet]

Hum, okay, thanks for the tip! 😄

IMHO, it's not super intuitive and would deserve a remark somewhere in a troubleshooting section. That said, I guess it's not specific to omnisharp and impacts basically every other extension (sounds like a bad design decision from the VS Code team).

[gregg-miskelly]

Sure, I can add a note to the document tomorrow. I am assuming you were following http://aka.ms/vscclrdogfood?

[gregg-miskelly]

Okay, I added a quick note now actually.

[kevinchalet]

Yep. The related instruction (File->Open and open the downloaded vsix file) is clear when you think about it, but it's common for people to run downloaded files directly from their browsers, which directly launches the VSIX installer in this case.

[kevinchalet]

Thanks 👏