Hello,

I get the following error when trying to complete a challenge - on TRAILHEAD.

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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.DmlException: Insert failed. First exception on row 0; first error: FIELD_INTEGRITY_EXCEPTION, User: id value of incorrect type: 00561000000lBQ4AAM: [User__c]
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Any assistance would be appreciated.

Thank you