Journey Map Error

6:43:57 SEVERE [Minecraft main thread]: net.techbrew.mcjm.ui.MapOverlay.a() Unexpected exception in MapOverlay.drawScreen(): java.lang.IllegalArgumentException: input == null!
06:43:57 SEVERE [Minecraft main thread]: net.techbrew.mcjm.ui.MapOverlay.a() java.lang.IllegalArgumentException: input == null!
    at javax.imageio.ImageIO.read(Unknown Source)
    at net.techbrew.mcjm.io.FileHandler.getImage(FileHandler.java:100)
    at net.techbrew.mcjm.EntityHelper.getEntityImage(EntityHelper.java:129)
    at net.techbrew.mcjm.ui.MapOverlay.drawEntityLayer(MapOverlay.java:855)
    at net.techbrew.mcjm.ui.MapOverlay.a(MapOverlay.java:166)
    at bfr.b(EntityRenderer.java:1168)
    at EntityRendererProxy.b(EntityRendererProxy.java:20)
    at net.minecraft.client.Minecraft.K(SourceFile:597)
    at net.minecraft.client.Minecraft.run(SourceFile:526)
    at java.lang.Thread.run(Unknown Source)