Xcode 8 beta: Testable names must be unique

Question

I installed Xcode 8 beta 3 and tried to convert the source files to Swift 3. Does not work as I get the following error every time:

Testable names must be unique

Any idea what this means?

Answer 1

Is there any duplicated TestableReference in your .xcscheme file? Please check the BuildableName duplication. Just delete the unnecessary TestableReference.

Answer 2

I wasn't able to convert my project until I added all the 'Test Schemes' in the drop down list (Manage Scheme and clic + button)