Importing data is not working getting error

Importing data is not working getting error

I am trying to import the files that I exported from version 5. I have been able to import 3 of the 5 files I exported. My contacts and potentials are not importing. The files are .csv and are not even a half mb. Contacts has only 300 in it and potentials is much smaller. I am attaching screenshots to show.

Please help me!!!

thanks,
Otis