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ryg sinryg sin 

many to many relationsjip

Ig et an error saying ,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: 0051a000000O7ECAA0: [User__c]

Can you please guide me what is wrong?
could you share the code . basically what this says is there is no user record in the org with the Id 0051a000000O7ECAA0 .