Grader Error: Grader feedback not found in C3W1

Dear @Samira_Ghodratnama ,

Sorry to hear that.

Kindly follow the method mentioned in this link Clean_copy. (Thanks @paulinpaloalto)

I followed exact steps mentioned in the post and after several try it worked out.

Steps:

  1. Rename your current notebook.
  2. Open clean version of notebook as mentioned in the link.
  3. Carefully copy everything to the new notebook.

I hope it helps.

All the best.