The details of the invitation you requested are missing or the invite organiser has decided they do not wish you to attend.
If the latter please respect their wishes. Its their invite and works to their rules.
Don't be too upset; there are other users and invites on the site, and the blocking system can work in your favour too.
Disclaimer: Please note that the invitations to meet up and events are arranged by the site's user base, and are in no way condoned as official by this site. If you have any concerns about any items listed on this page then please contact us. Normal personal security issues apply. Please refer to our Online Safety page for tips on keeping safe.