The site is on 1.6.1 and with the recent changes facebook made, oauth login no longer works. The only thing I changed was the OAuth redirect URLs at Facebook to now contain /_oauth/facebook, but the server throws an exception with the server logs containing
Exception while invoking method 'login' Error: Failed to complete OAuth handshake with Facebook. failed [400] {"error":{"message":"Invalid verification code format.","type":"OAuthException","code":100,"fbtrace_id":"abcdefg"}}
anybody knows how to fix that?