trying to login using Google, I get a page not found error on the callback URI:

https://www.vaxbarn.com/index.php?option=com_jlexcomment&task=user.oauth&type=google&code=***&scope=email+profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile+https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email+openid&authuser=0&prompt=consent

Loging using Facebook work fine.