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I highly recommend you ditch the IDE and use the command line and a basic text editor until you understand the basics.

Your original problem was that you were trying to use the Persoana class...

I can't access imgur, which is why we ask you to copy/paste the text instead.

If the class you're using is in a different package than the class you're in, you either need to import it or use the...

Are these classes in two separate files?

Is one of them in a package?

Have you imported the class you're trying to use?

What specific error are you getting?

What is the error? Please copy and paste the full stack trace instead of posting a screenshot.

What code are you running? Please copy and paste an MCVE instead of posting a screenshot.