java.util.concurrent.ExecutionException: java.lang.ClassCastException: com.gamebuster19901.dungeonforge.tileentity.TileEntityDoorwayMarker cannot be cast to minechem.block.tile.TileDecomposer
    at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_144]
    at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_144]
    at net.minecraft.util.Util.runTask(Util.java:54) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:798) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
Caused by: java.lang.ClassCastException: com.gamebuster19901.dungeonforge.tileentity.TileEntityDoorwayMarker cannot be cast to minechem.block.tile.TileDecomposer
    at minechem.block.BlockDecomposer.addStacksDroppedOnBlockBreak(BlockDecomposer.java:79) ~[BlockDecomposer.class:?]
    at minechem.block.BlockSimpleContainer.breakBlock(BlockSimpleContainer.java:31) ~[BlockSimpleContainer.class:?]
    at net.minecraft.world.chunk.Chunk.setBlockState(Chunk.java:615) ~[Chunk.class:?]
    at net.minecraft.world.World.setBlockState(World.java:400) ~[World.class:?]
    at com.gamebuster19901.dungeonforge.item.itemblock.ChangeableBlockItem.onItemUseFirst(ChangeableBlockItem.java:44) ~[ChangeableBlockItem.class:?]
    at net.minecraft.item.ItemStack.onItemUseFirst(ItemStack.java:214) ~[ItemStack.class:?]
    at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:462) ~[PlayerInteractionManager.class:?]
    at net.minecraft.network.NetHandlerPlayServer.processTryUseItemOnBlock(NetHandlerPlayServer.java:767) ~[NetHandlerPlayServer.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68) ~[CPacketPlayerTryUseItemOnBlock.class:?]
    at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13) ~[CPacketPlayerTryUseItemOnBlock.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) ~[PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_144]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_144]
    at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
    ... 5 more