Error while compiling BGrade: 'PlayerInventory' does not contain a definition for 'AllItems' and no accessible extension method 'AllItems' accepting a first argument of type 'PlayerInventory' could be found (are you missing a using directive or an assembly reference?) | Line: 832, Pos: 51

Same here

try

https://umod.org/community/bgrade/54174-bgrade-no-found

Thank you terrabash. 🙂

https://pastebin.com/4M8cLkqr

copy paste this into your bgrade.cs plugin file