NPE - Can't Find AbilityCategory

14:03:58.220 SEVERE Thread-7 RuntimeReferenceContext:110 Cannot find Ability Category Favored Enemy
14:03:58.228 SEVERE Thread-7 SourceFileLoader:511 Exception loading files.
java.lang.NullPointerException
at pcgen.cdom.reference.CDOMTransparentSingleRef.resolve(CDOMTransparentSingleRef.java:214)
at pcgen.core.GameMode.resolveReferenceManufacturer(GameMode.java:2482)
at pcgen.core.Campaign.applyTo(Campaign.java:92)
at pcgen.persistence.SourceFileLoader.loadCampaigns(SourceFileLoader.java:557)
at pcgen.persistence.SourceFileLoader.loadCampaigns(SourceFileLoader.java:479)
at pcgen.persistence.SourceFileLoader.execute(SourceFileLoader.java:214)
at pcgen.gui2.PCGenStatusBar$TaskExecutor.construct(PCGenStatusBar.java:167)
at pcgen.gui2.PCGenStatusBar$TaskExecutor.construct(PCGenStatusBar.java:130)
at pcgen.gui2.util.SwingWorker$2.run(SwingWorker.java:146)
at java.lang.Thread.run(Unknown Source)