Object of type 'NoneType' has no len()

There was a problem compiling the code from your notebook. Details:
object of type ‘NoneType’ has no len()

getting this error for all graded fuctions, but all the functions have the correct output.

what to do?

Hello @Dhakksinesh,

I think you have some errors from the beginning of your notebook. Can you send a private message to me and attach your notebook, to me to walk through so I can get away to help out?

Thanks

updating the lab solved this.

step 1 - click help button in the lab page
step 2 - under UPDATE LAB TO THE LATEST VERSION click get latest version
this resets the lab to new version
step 3 - redo the assignment and submit

grader output passed all test cases.

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