'PlayerInventory' does not contain a definition for 'AllItems' and no accessible extension method 'AllItems' accepting a first argument of type 'Playe...
rInventory' could be found (are you missing a using directive or an assembly reference?)

try

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

seems to work thanks fella

how did you fix this? 

https://pastebin.com/4M8cLkqr

copy paste this into your bgrade.cs plugin file