CardDb exception

I'm having problems adding new cards. I'm trying to add Mystic Compass, but when I add the txt file, then start Forge, I get the following exception:
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at forge.card.CardDb.addNewCard(CardDb.java:91)
at forge.card.CardDb.<init>(CardDb.java:58)
at forge.card.CardDb.setup(CardDb.java:36)
at forge.card.cardFactory.PreloadingCardFactory.readCards(PreloadingCardFactory.java:82)
at forge.card.cardFactory.PreloadingCardFactory.<init>(PreloadingCardFactory.java:53)
at forge.AllZone.getCardFactory(AllZone.java:226)
at forge.view.swing.ApplicationView.setModel(ApplicationView.java:123)
at forge.view.swing.Main.main(Main.java:39)
at forge.Gui_NewGame.main(Gui_NewGame.java:27)
If I delete my new card file, Forge runs without exception.
-slapshot5
java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at forge.card.CardDb.addNewCard(CardDb.java:91)
at forge.card.CardDb.<init>(CardDb.java:58)
at forge.card.CardDb.setup(CardDb.java:36)
at forge.card.cardFactory.PreloadingCardFactory.readCards(PreloadingCardFactory.java:82)
at forge.card.cardFactory.PreloadingCardFactory.<init>(PreloadingCardFactory.java:53)
at forge.AllZone.getCardFactory(AllZone.java:226)
at forge.view.swing.ApplicationView.setModel(ApplicationView.java:123)
at forge.view.swing.Main.main(Main.java:39)
at forge.Gui_NewGame.main(Gui_NewGame.java:27)
If I delete my new card file, Forge runs without exception.
-slapshot5