This project is abandoned and its default file will likely not work with the most recent version of Minecraft. Whether this project is out of date or its author has marked it as abandoned, this project is no longer maintained.
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This is a plugin called PluginHide. It will show a fake plugin menu for players who type /plugin.
Player can do /pl to see all plugins
Also, Business is spelled wrong, you spelled it like buissnes
In reply to Chimiichanka:
No Bussines is spelled correctly :)