gameinfo.gi is a configuration file for Source games, which the game loads on startup. It contains blocks of configs in the form <name> "<value>", split into multiple categories/sections by {}.
If you get an error message like FATAL ERROR: ... <something>.xml that means a old/outdated/broken mod is responsible.
Solutions:
- Delete the mods: go to
steamapps/common/Deadlock/game/citadel/addonsand delete all its contents. - Disable mod loading: open
steamapps/common/Deadlock/game/citadel/gameinfo.giand search for"citadel/addons". add//in front of that line (in front ofGame):// Game "citadel/addons". Then make sure to start through steam, not a mod manager. - this allows you to keep your mod folder intact