Message boards :
Posted 30 days ago by Woodles
From the front page:
Due to spammers creating millions of bogus accounts, invite codes have been enabled and will change on a regular basis. Please contact the project admin to get the invite code so you can create an account. You may request the invite code by contacting the site admin
Are you using an account manager? I think you'll need to contact the project admin and manually create an account first, after that, it should be straightforward to join the project.
I'm fairly sure it's not the end of the project :D