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Kobus BoshoffKobus Boshoff 

Please assist. Error message: There was an unexpected error while verifying this challenge. Please post to the developer forums and reference error id: MCJDWELT

VinayVinay (Salesforce Developers) 
Hi,

Try to use new playground and see if it works.

If you still see issue kindly reach out to trailhead support team using below link.

Support:https://trailhead.salesforce.com/help

Thank you!

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Thanks,
Vinay Kumar
Kobus Boshoff 7Kobus Boshoff 7
Hi Vinay,

Used a new playground. Still got the below message:
Challenge not yet complete in kobus@number1.com
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: KLFJGSWK
Kobus Boshoff 7Kobus Boshoff 7
Hi Vinay,

My apologies. I used the original playground in error. I did it afterwards on the newly created playground and it has now been completed. I selected the wrong one, hence I got the same error. 

Thank-you for your help. 
Regards
Kobus
VinayVinay (Salesforce Developers) 
Good to know it worked.

Please mark as Best Answer if above information was helpful so that it can help others in the future.

Thanks,