Tried to edit a non-existant item: body/feet

The message you're seeing is unrelated to the issue you're experiencing (its overly verbose logging fixed in the next spt version), its likely a mod issue, try removing all mods and add them back in small groups until you find the culprit.

I just checked your server log, lol

Having any kind of outdated mods in your game means your support thread gets immediately closed without further notice.