maxGamers is not in the range of gamers that are supported in a network session.
The XNA Framework supports multiplayer sessions between two and 31 players in a session for
a Windows or an Xbox 360 game.
privateGamerSlots is less than 0 or greater than maximumGamers.
Note that you must wait for any of these methods to return before you can create a new
network session. To support this, you may use the asynchronous methods
BeginJoin, and the corresponding
EndJoin methods to detect when the operation is complete.