Unable to login to my own forum account after enabling Oneall!

After I installed Oneall and connected several social media platforms and selected Oneall in the authentication page for OAuth in phpbb forums, I can no longer log in at all into my admin account! What can I do? It's stuck in an impossible loop!

https://www.happierabroad.com/forum/ucp.php?mode=login

This page isn’t working www.happierabroad.com is currently unable to handle this request.
HTTP ERROR 500

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