It would be good to show the PCB regions that DRC complains about.
Read:
to find how to get higher user level.
I have always the problem to find error in the list (File - Board Setup - Design Rules - Violation Severity) if I want to change it between Error - Warning and Ignore.
I looked through list 2 times and didn’t found any error starting with “Front Solder Mask…” or “Rear Solder Mask…”.
What KiCad version do you use. As wording seems being different than probably you use not last stable release.