After logging in on facebook, error 500 pops up. I tried "php flarum cache: clear" and it does not work. So I saw "debug = true". I am asking for help, I do not know what to do.
akociszewski can you do me a favour and post your composer.lock file? I'm investigating the easiest solution to get this solved for all users.
Kindly take a look at my issue, possibliy similar to akociszewski
UPDATE: Fixed using the method shared by @QaziSalmanAhmad at https://discuss.flarum.org/d/6438-facebook-login-error/5
I updated the composer and installed the plugin again and now it works. You can delete the post