It does not allow creating new categories

I'm trying to add new categories, but it doesn't let me. I had already installed the panel, but when I want to add new categories from the plugins that I also bought from you, it doesn't let me.

it is necessary to add a category to the

ServerPanel category, while specifying:

Type: Plugin

PluginName: the name of the plugin you want to integrate

PluginHook: API of the plugin that is created to work with ServerPanel
 

Also in my plugins PluginHook is always API_OpenPlugin, about other people's plugins - I don't know