When submitting a new release to an existing release group, the following error message appears:

>>Internal Server Error
>>Oops, something went wrong!
>>
>>Error message: (No details about this error are available)
>>
>>We're terribly sorry for this problem. Please wait a few minutes and repeat your request — the problem may go away.
>>
>>If the problem persists, please report a bug and include any error message that is shown above.