Hi! I passed all the tests and my code did everything that was required. However I get a 0/100.
I get the following message:
Sorry, your submission was incorrect. Please try again. Invalid control character at: line 851 column 1810311 (char 9293812)
Could you please help me out?
In general, passing the unit tests does not guarantee your code is perfect.
But first, to clear the decks:
Try restarting the kernel and clearing the output, then run all the cells, check your results in detail , and then if it looks OK, then submit it again.
Please post back your results.
I have a similar problem. I restarted the kernel, cleared the output, and even used a fresh new file. There were some commented prints where I tried to uncomment and check again. None of them helped and I still get the same error. My outputs seem correct. This is the error I get:
Sorry, your submission was incorrect. Please try again. Expecting value: line 1 column 1 (char 0)
I’m not sure what causes this issue (“Expecting value…”). It was reported by one other student a couple of days ago.
Just a thought, have you ever 1) added a new cell to this notebook, or 2) renamed the notebook file?
I renamed the notebook after the grader issue to get a new unedited file. I submit the one with the original name. Regarding a new cell, there is an empty cell at the end of the notebook. I tried to remove it and submit the notebook again, but no luck in changing the grader output.
Update for other students who find this thread:
Try using “Kernel → Restart & Clear Output”, then “File → Save and Checkpoint”, then (without running any notebook cells), submit the notebook for grading.
This seems to help the grader cope with notebooks that have a lot of data in the “output” cells, like audio files and spectrogram graphics.