Payment wizard isn't working

I have a camp registration form on my site that used to work but now gives an error:

"We cannot process this transaction because there is a problem
      with the PayPal email address supplied by the seller. Please
      contact the seller to resolve the problem."

When I try to reset the payment system by deleting the current payment field and adding a new one "PayPal" under payment tools, I get an error that says that this functionality isn't available click payment wizard to setup (or something like that) and when I click the payment wizard nothing happens...

Help?

Thx Ty

Thank you for contacting us.

I have made a test submission and I was properly redirected to the PayPal payment page:

Please try to clear your browser cache and cookies, then re-check the form and payment wizard.

If the issue still persists on your side, please let us know.