I go to start up the game and I get this error:
"Error [modneverencumbered]game\player\playerwitcher.ws(1115): Cannot override function 'IsEquippedSwordUpgradedWithOil' declared 'final' in class 'CR4Player'.

Warning [content0]engine\environment.ws(30): Global native function 'EnableDebugOverlayFilter' was not exported from C++ code.
Warning [content0]engine\environment.ws(32): Global native function 'EnableDebugPostProcess' was not exported from C++ code.
Warning [content0]engine\showflags.ws(11): Global native function 'DebugSetEShowFlag' was not exported from C++ code."
I've tried disabling all my most recent mods to no avail, and I don't know code at all, so I can't determine what other mod or mods got messed up. Any help would be greatly appreciated.

Update: found the offending mod, though I have no understanding as to why it was affecting applying oils to weapons.

Read this one:

https://forums.cdprojektred.com/index.php?threads/game-crash-when-i-enter-swamp-areas.9750281/#post-9773701

try to upgrade to the latest version

what was the offending mod???