Hello,
posting the failing code and the error message directly will improve your chances of getting a useful response.
I'm probably not the only one who hates looking at .ipynb files in raw format.
I did not find a permission error in your file.
There's an error messages about an 'mpg.csv' file not being found.
Did you create or download that file before trying to open it?
If yes, did you put it into the working directory of your notebook kernel?
To print the working directory of your (Python) notebook kernel, try to execute:
!pwd
cheers,
Roland