- last post: 01.01.0001 12:00 AM PDT
What happened was this person sent you an invite to a clan and then left the clan and there wasn't anyone in the clan after he left. This means that you can't join it because it doesn't have an Overlord or any members anymore.
All you can do is wait until the message expires (either 2 weeks or a month). It's annoying, but it happens.