diff --git a/scripts/create_expected.py b/scripts/create_expected.py
index a26337c..8cf31c3 100755
--- a/scripts/create_expected.py
+++ b/scripts/create_expected.py
@@ -19,12 +19,22 @@
 root = Path(__file__).parents[1]
 data_files = root / "tests" / "data-files"
 
+errored = False
 for path in data_files.iterdir():
     if path.name in EXCLUDE or path.name.startswith("."):
         continue
     print(path)
-    item = stac.create_item(str(path))
-    item.set_self_href(str(data_files / path.name / "expected_output.json"))
-    item.make_asset_hrefs_relative()
-    item.validate()
-    item.save_object(include_self_link=False)
+    try:
+        item = stac.create_item(str(path))
+        item.set_self_href(str(data_files / path.name / "expected_output.json"))
+        item.make_asset_hrefs_relative()
+        item.validate()
+        item.save_object(include_self_link=False)
+        
+    except Exception as e:
+        print(e)
+        errored = True
+
+if errored:
+    print("At least one error occurred")
+    exit(1)
diff --git a/src/stactools/sentinel2/stac.py b/src/stactools/sentinel2/stac.py
index 0d94262..668dbe3 100644
--- a/src/stactools/sentinel2/stac.py
+++ b/src/stactools/sentinel2/stac.py
@@ -312,6 +312,8 @@ def image_asset_from_href(
             resolution = highest_asset_res(band_id_search.group(1))
         elif IS_TCI_PATTERN.search(asset_href):
             resolution = 10
+        else:
+            raise ValueError(f"Could not determine resolution for {asset_href}")
 
     shape = list(resolution_to_shape[int(resolution)])
     transform = transform_from_bbox(proj_bbox, shape)