I am keep getting error in submitting the C2_W3_Assignment where even if i restart/save/make new notebook all of them reach this wierd error that Grader Error: Grader feedback not found error. Any help will be appreciated.
idk what i did but it just started to work?
Typically that error means that you’ve made some unexpected change to the notebook, and made the grader unhappy.
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another reason would you have made changes in assignment were you weren’t suppose to.
Try to get a fresh copy, and re-do assignment. Make sure when you write codes this time, only write codes between ###START AND END CODE HERE###
Without deleting or editing anything outside these markers.
Also remember these markers come with instructions, you are only suppose to write codes as per instructions given.
Hope this helps
To get a fresh copy, refer this 
1.a
Regards
DP