I recently changed class from farmer to trader but im getting an error message “your permission is..

Not certain but have you tried finding an ally base in the map. Tapping on it and choose 'trade'. Does it work that way?

If you try to trade from the building and then look for a base location you might not gave permission to do this. R1 members can't see the location of other bases in the alliance. If this might be your issue then ask the alliance leaders to promote you so you can trade more easily.

I get the same error. It has been days and still the same error. I cant find if there is a level that you need to be or if there is something specific that gives the permissions.