When change pass pma and change config.inc.php success.
Obviously this action was
NOT a success or you would not get an error.
The MySQL user
pma does not have a password by default nor does the MySQL user
root.
You should test your XAMPP installation by not changing anything until you know all the default behavior works without errors.
BTW to change the MySQL root users password you go to
http://localhost/xampp/
and select the Security menu item in the left menu frame and then follow the link to fix the server security issues.
===========================================
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2. Build Rich
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Fully working with
NO donations required to get a user/password
===========================================