Collectible Card Game Headquarters

I get this error after creating a gauntlet and then hitting the start command. Any suggestions?

Description: [describe what you were doing when the crash occurred]

NullPointerException | Open

Code: Select all

Forge Version:    1.5.5-r${forge.revision}${forge.specialStatus} (mixed revisions detected; please update from the root directory)
Operating System: Windows 7 6.1 x86
Java Version:     1.7.0_45 Oracle Corporation

java.lang.NullPointerException
   at forge.game.GameNew.newGame(GameNew.java:281)
   at forge.game.Match.startGame(Match.java:91)
   at forge.control.FControl.startGameWithUi(FControl.java:428)
   at forge.gui.home.gauntlet.CSubmenuGauntletLoad$6.run(CSubmenuGauntletLoad.java:119)
   at java.awt.event.InvocationEvent.dispatch(Unknown Source)
   at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
   at java.awt.EventQueue.access$200(Unknown Source)
   at java.awt.EventQueue$3.run(Unknown Source)
   at java.awt.EventQueue$3.run(Unknown Source)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
   at java.awt.EventQueue.dispatchEvent(Unknown Source)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
   at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
   at java.awt.EventDispatchThread.run(Unknown Source)