As with all online games, sometimes there are glitches communicating with the server.  Before sending in a ticket it is often worth simply logging out and logging back into Stronghold Kingdoms*.  This can often fix a number of small issues that crop up. 

1. Log out of the game
2. Close the Stronghold Kingdoms program
3. Re-open Stronghold Kingdoms
4. Log into the game

If this does not fix the issue then please send us a support ticket.

* It's the SHK equivalent of restarting your computer when Windows goes wrong or hitting the TV!