Cant use inventory in perfectworld official server

"Perfectworld" - if this is a unofficial server for CS:GO, then most likely there may be protection. Ask for Technical Support

perfectworld is a chinese server, therefore i suggest him to move to another country thats better

move to a better country
then ez fix

Maybe there is protection there, an addon to server skins?

nah, china has some skins that is changed and it probably broke the whole inventory changer

Maybe, maybe