For some months now, logging in to the forum via Twitter has not been working. I have tried to resolve this, but unfortunately I have not been able to find a solution, so I have turned off the Twitter login option.
If you are an existing forum user who previously logged in with Twitter and do not have another login method set up, such as an email address, you could email me at support@pilotmoon.com I can then add an email address to your account for you.