Why can't i log on? it keeps saying, "canot connect to server please try using a different world"

ok so one time i was training on my def pure called "lol def", and, well i needed 2 go get somethin, so i logged off and got it and like a min l8er i tried to log on, and it said "cannot connect to server, please try using a different world.", so what do i do? it's not just me that's having this happen to...

Bro read the other like 10 posts about that. It happens randomly when you log off. I believe its an anti-lag/anti-glitch program that temporarily ignores your ips request for access in an attempt to protect the server from crashing. It sucks, we know