java.lang.RuntimeException: java.lang.NullPointerException

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java.lang.NullPointerException:
at mobac.mapsources.loader.MapPackManager.installUpdates(MapPackManager.java:74)
at mobac.mapsources.DefaultMapSourcesManager.loadMapSources(DefaultMapSourcesManager.java:71)
at mobac.mapsources.DefaultMapSourcesManager.initialize(DefaultMapSourcesManager.java:117)
at mobac.Main.(Main.java:52)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at mobac.StartMOBAC.main(StartMOBAC.java:43)

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