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Mounika BuddabathinaMounika Buddabathina 

Trailhead Error EJRESRVA

Hello Community,
I encountered the following error while working on Manage Chatter Unit ,

Challenge Not yet complete... here's what's wrong: 
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: EJRESRVA
I tried doing using a new Developer Edition but havn't worked but getting the same error.
Please help me out.

SandhyaSandhya (Salesforce Developers) 

Try to logout from the account and log in again to check the challenge.If this does not work I would suggest try in new trailhead playground as this error may be due to pre existing configuration.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
Best Regards