Console log

2013-05-05 19:17:30 [INFO] [STDERR] Exception in thread "Thread-34" java.lang.NullPointerException
2013-05-05 19:17:30 [INFO] [STDERR] at com.thevoxelbox.voxelmap.VoxelMap.yCoord(VoxelMap.java:556)
2013-05-05 19:17:30 [INFO] [STDERR] at com.thevoxelbox.voxelmap.VoxelMap.getPixelColor(VoxelMap.java:1309)
2013-05-05 19:17:30 [INFO] [STDERR] at com.thevoxelbox.voxelmap.VoxelMap.renderChunk(VoxelMap.java:1286)
2013-05-05 19:17:30 [INFO] [STDERR] at com.thevoxelbox.voxelmap.util.MapChunk.drawChunk(MapChunk.java:57)
2013-05-05 19:17:30 [INFO] [STDERR] at com.thevoxelbox.voxelmap.util.MapChunkCache.drawChunks(MapChunkCache.java:125)
2013-05-05 19:17:30 [INFO] [STDERR] at com.thevoxelbox.voxelmap.VoxelMap.run(VoxelMap.java:586)
2013-05-05 19:17:30 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)
2013-05-05 19:17:30 [INFO] [STDERR] java.lang.IndexOutOfBoundsException
2013-05-05 19:17:30 [INFO] [STDERR] at com.eloraam.redpower.core.ItemExtended.d(ItemExtended.java:33)
2013-05-05 19:17:30 [INFO] [STDERR] at up.i(Item.java:458)
2013-05-05 19:17:30 [INFO] [STDERR] at up.l(Item.java:600)
2013-05-05 19:17:30 [INFO] [STDERR] at ur.r(SourceFile:334)
2013-05-05 19:17:30 [INFO] [STDERR] at atr.a(GuiIngame.java:406)
2013-05-05 19:17:30 [INFO] [STDERR] at ban.b(EntityRenderer.java:982)
2013-05-05 19:17:30 [INFO] [STDERR] at net.minecraft.client.Minecraft.J(Minecraft.java:884)
2013-05-05 19:17:30 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:773)
2013-05-05 19:17:30 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)