C2_W1 stderr error

Reason could be any of the below for grading failing according to the details shared by you

  1. any code error especially related like using global variable instead of local variable or vice versa.
  2. Removing any of the codes or instructions outside of markers ###START AND END CODE HERE###
  3. if you have added too many #print options
  4. if you have added or deleted any other cells other than grade cell.
  5. if you have renamed your assignment file.
  6. CHECK if you have left any None between the codes.

to resolve this issue in case you are confident of your codes, then get a fresh copy and re-do assignment.

To get a fresh copy follow below link, refer 1a

But make sure this time you only write codes between markers ###START AND END CODE HERE###

Regards
Dp