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Marshall PriestMarshall Priest 

I tried to complete the 'Install AppExchange Packages (Also Like a Superhero)' trailhead and I get this error message:

Best Answer chosen by Marshall Priest
SandhyaSandhya (Salesforce Developers) 
Hi,

This error might be bcause of the pre existing configuration which you have done for other challenge.I would suggest install in the new trailhead playground.

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

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Marshall PriestMarshall Priest
Challenge Not yet complete... here's what's wrong:
There was an unexpected error in your org which is preventing this assessment check from completing: System.QueryException: List has more than 1 row for assignment to SObject...not sure why this didn't attach to the original question
SandhyaSandhya (Salesforce Developers) 
Hi,

This error might be bcause of the pre existing configuration which you have done for other challenge.I would suggest install in the new trailhead playground.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
 
Best Regards
Sandhya
 
This was selected as the best answer
Marshall PriestMarshall Priest
Thank you. This worked.

Cheers,

Marshall