Have you followed the section for checking your key and certificate?
In order to fix the certificates and key mismatch, you can generate and self-sign new ones following the section on how to create SSL certificates again.
In order to revert back to using your app without SSL, just follow the section about enabling HTTPS with SSL certificates in reverse, reverting all changes.
Hope it helps, dont hesitate in asking again if you still have doubts or have more issues.
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