I cant do /pex
I am op
It saids: sorry, you do not have enough permissions

Please help!

Don't use OP. Op is for servers that don't use any plugins at all. ("Vanilla" servers.)

Which version of Minecraft and PEX are you attempting to use?

Are there error messages in the startup log? (Copy the startup log to Pastebin and leave the link here.)

Show me the permissions.yml file which is inside the plugins\PermissionsEx folder. (Copy it to Pastebin, leave the link here.)

I found out why!
But thank you

What was the solution?

It was in the config you have to allow op commands.

¯\_(ツ)_/¯