[Steam] I have a json shop without any problems, but I get an in-game permission error.

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Let me explain the situation as follows: I downloaded a plugin for the shop, of course I also downloaded the premission plugin. I prepared my own json shop code in the shop config section. It says that there is no error in my json code, but when I start it, it loads the plugins, but when I try to use the kit when I enter the game, it gives a permisson error. When I type /shop, it does not open a page for me in the chat section. The use / shop page appears, but even if I use the command, a shop does not appear. I can neither access the shop nor allow anyone else to use the kits. It says there is no permission. I don't know what to do, frankly, I can't go any further from here.