java.lang.ArrayIndexOutOfBoundsException: -38
    at net.minecraft.src.ExtendedBlockStorage.setExtBlockID(ExtendedBlockStorage.java:79)
    at net.minecraft.src.Chunk.<init>(Chunk.java:136)
    at net.minecraft.src.ChunkProviderTropics.provideChunk(ChunkProviderTropics.java:292)
    at net.minecraft.src.ChunkProvider.loadChunk(ChunkProvider.java:100)
    at net.minecraft.src.ChunkProvider.provideChunk(ChunkProvider.java:126)
    at net.minecraft.src.World.getChunkFromChunkCoords(World.java:640)
    at net.minecraft.src.World.getBlockId(World.java:555)
    at net.minecraft.client.Minecraft.preloadWorld(Minecraft.java:2191)
    at net.minecraft.client.Minecraft.changeWorld(Minecraft.java:2078)
    at net.minecraft.client.Minecraft.usePortal(Minecraft.java:1989)
    at net.minecraft.src.ItemTropicsPortalStarter.onItemRightClick(ItemTropicsPortalStarter.java:29)
    at net.minecraft.src.ItemStack.useItemRightClick(ItemStack.java:139)
    at net.minecraft.src.PlayerController.sendUseItem(PlayerController.java:77)
    at net.minecraft.client.Minecraft.clickMouse(Minecraft.java:1378)
    at net.minecraft.client.Minecraft.runTick(Minecraft.java:1794)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:819)
    at net.minecraft.client.Minecraft.run(Minecraft.java:747)
    at java.lang.Thread.run(Unknown Source)
Stopping!