After installation, enter the commands to grant rights and open the menu.
 After that, he changed the value and closed it.
 After that, as an admin, I can't walk, fly and teleport, and I can't get out of stealth mode.
 The menu does not reopen.
 Also I can't write in the chat, only the console. Uninstalled and reinstalled the plugin, but no change. 
How to go back, or how to open this menu?