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Error in Trial Head - Apex Rest Callout


I was working on the Trial head Apex Rest Callout, I clicked on the check challenge, I received the below error.

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.NullPointerException: Attempt to de-reference a null object

When I run the test class in the trialhead palygroud I received 100% code coverage.

Can anybody help me on this issue.