User is unable to delete components from Service/VF composition.  On clicking delete icon of dragged resource error is displayed (Attached  screenshot)

Steps :

1. Create Service/VF

2. Go to composition page

3. Drag and drop another Component/VF from Elements box to Composition canvas

4. Delete  dragged component from composition on clicking delete icon of component.

 Expected : User should be able to delete component.

Actual :  500 Server error is displayed on UI