Problem on Learn Flakes registration

I received an invitation, everything arrived just fine, but when I click on the invitation link the page loads and shows the following message:

An error has occured!
The invite code is either missing, invalid or expired. If you copy and pasted the link from your email please make sure you copyed the FULL address given.


1 - I use the link two hours after I receive it.
2 - There's no chance someone used it before me, since it's a personal account and the e-mail was sent by learn flakes it self.
3 - I tried to contact their staff, but got no response.

Can anyone help me?
I really want get in to this tracker, so i can learn i couple of thing and get a better job.

Thank you