Solved Problem with adding message is no permissions

Hello, sorry for my bad English, I only speak Spanish.

I've been trying to change the permissions no message, but it's always the same result:
"I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is in error"

I do not know much about this but I want to learn, then I would appreciate your help very much.

My Code:

Code:java

 
Solved
 

Note: you can change from plugin.yml, but I want from java.