I looked up the classes in your error, its related to your profile Common skills, perhaps its failing due to the server attempting to give you skill points
I've loaded your profile on my machine and am having trouble reproducing the error, if you have any guaranteed steps i can perform, that would be appreciated
I've just booted up the game for the first time since last night (when I ran into the issue), and tried to do everything that was causing the error last night (selling to traders, flea market, loading/unloading ammo, adding/removing weapon mods, moving things around), and it's not occurring anymore. I should note that I restarted the game when this happened last night, but I didn't shut down and restart the server, which I did do today - perhaps that fixed the issue?
Regardless, it seems to be working just fine now.