Attempt to index a nil value?

[VimyKatusa]

Good evening! I'm extremely new to scripting, so just understand that this may be an extremely stupid question.
Essentially, upon loading into my server, the game is stuck on the "loading character" screen, and my cmd shows the following:
SCRIPT ERROR: @redemrp_identity/server/sv_main.lua:31:: attempting to index a nil value (global 'MySQL')

I have no idea what's causing this issue, nor how to fix it. Any response is appreciated.
Thank you!

[A1phaK1ng]

see if that will help