Recent change from Blizzard... LAME.

Message: Interface\AddOns\GogoLoot\loot.lua:937: SetLootThreshold(): threshold must be between 2 and 6
Time: Fri Sep 3 13:16:14 2021
Count: 1
Stack: Interface\AddOns\GogoLoot\loot.lua:937: SetLootThreshold(): threshold must be between 2 and 6

Two places, right click menu on Character Frame:

Master Looter Settings:

Removed the code that was obsolete. Done some basic testing with 2 accounts on PTR, no errors or unexpected behaviour.
However, this still requires testing in dungeons / raids, just to be sure everything works as expected!!

https://github.com/Gogo1951/GogoLoot/tree/NoGreyOrWhiteItemOptions