Hello Everyone , while doing Path and Workspace Trail I'm facing issue in "Optimize Sales Processes Using Path" Module, As per challenge I have done all require things but it is still not completed , the following error is showing - 

Challenge not yet complete in TMG playground
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: GJYUBJFV

Please help.