Error related to test case function

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Can someone expalin why this error is appearing and how to fix it?

Please use the “pencil” icon in the thread title, and move your thread to the correct forum for the course you’re attending.

That will draw attention to it from that course’s mentors.

Hi @Ahmad_Khalid1,

Firstly, do what Tom mentioned above.

Secondly, looking at the error, make sure you have ran every cell above before this.