Guild joining?

Well as it says..... you're only allowed to join (plus leave and join) a certain amount per day, and you've used that quota up.

I guess you've joined guilds had a look around and then gone to find something better.  This isn't how the game wants you to do it.  You should check the stats, what they say about themselves and then choose to join or not to join.

Having players coming and going would be a real nightmare for the guilds.