Looks like Missing or corrupt files in the McAfee VSE 8.8 extension installation directory. Check in ePO console > Extension > VirusScan Enterprise.
As per logs it is happening when you trying to edit Access Protection policy.
thanks, I have already tried to remove and reinstall the extensions, but nothing, the error message appears again
I'll suggest to log a case with McAfee and submit the MER log collected from ePO server.