Hello Sagiraju,
Based on your error log, this post comment might help you understand why student codes error comes.
You might have basically not written code or incompletely written code for your grader exercise cell 1.
Although the link is from another assignment, but issue looks similar. Your cell 3 can’t compile code because your previous exercise cell is incomplete or have not been written with any code.
Please refer this post to have an understanding about student’s code error.
Otherwise, share a screenshot of your error log, to help you better.
Ideally if any issue which is different from post heading, it is better to create a new post by choosing the appropriate specialisation, course, week’s and assignment name with explanation of your issue encountered would be better approach to get faster reply from respective mentors.
Regards
DP