I got "[Image Library] There was a error querying Steam for workshop item data : Code (400)" message when load/reload the plugin, what does this mean? How can I clear off this message?

Nothing is working with the GUIShop, i have perms and it still says "There is something wrong the this shop. Please contact an admin."

If nothing is working it means you have messed up your guishop config. The shop's names must match for it to work and you must use the TitleCase Naming convention. 

my bad 😄 it's working