Really, with the same unitttests file? Perhaps you are using a different unitttests file locally? Can you try and reset the unnittests file on coursera (the same process as with the assignment) and resumbit again? But to be sure, reset both the assignment and unnittets file on the Coursera page and then resubmit your solutions!
In my case, I deleted the unitteste.py and clicked on Get latest version to fetch latest files.
It is unittest file that validate your code and give all sort of errors so good to get latest version of it!
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No. I have not used any local files.
All assignment exceises are done on the lab link provided by coursera.
To prove t i have attached the screenshots above for each excercise.
I have tried multiple times, but error remains same for 4th assignment.
Now I have submitted C2M1 assignment. Again same issue. Out of 4 assignment that passed all test in lav environment, on submission 1st failed. Resubmitted again
i have passed both assignments but its 75 instead of 100 
What is the detailed grader feedback for the “is_palindrome_fixed” function?
Filename: is_palindrome_fixed
0/25Score: 0 of 25
Grader output
Failed test case: is_palindrome_fixed thrown an exception when sentence = “I like bread”. Aborting unittest. Expected: is_palindrome_fixed should run for any string, but got: Exception thrown was: name ‘re’ is not defined.
I have already fixed the issue and it has passed all test cases.
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Great progressing!