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Could Not Instantiate Mail Function

So, not really sure what to say >.<
I installed Vanilla forums (2.1.11) and I tried to set up email registration and stuff, and when I tested it out I got the error in the discussion's title. I am hosting the website myself, so there isn't really anyone I can contact for help. I also tried using Gmail's SMTP server and it still didn't work.
Here is the SMTP settings I tried.



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