Thread:Extension talk:GoogleLogin/Internal error " WEBROOT /mediawiki-1.22.2/includes/htmlform/HTMLForm.php: HTMLForm: no submit callback provided. Use setSubmitCallback() to set one."/reply (22)

So, hello again! :) Can you please load this file and replace it with includes/specials/SpecialGoogleLogin.php? Can you then please test again?

Thanks again for your patient! :)