Unable to Join Server; Sent Back to Main Menu Immediately

[A Flaming Pineapple 0]

I join a server through DayZ Commander. Get past a loading screen of a tank. Then I get this huge grey wall of text in the chat box that flashes for a very brief moment before it kicks me back to the main menu. All I can make out of it is "you cannot play this mission". On the right side of the screen is a giant wall of green text of what looks like player names. It happens in the span of about half a second before i arrive back at the main menu. Anyone else have anything like this? And anyone know how to fix it? If someone can tell me how to stick a picture on here ( the one i have is too large) that would be great. You cant make out the text, but it gives you the idea of what im experiencing.