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java.lang.NoSuchFieldError: worldObj	at gr8pefish.ironbackpacks.util.helpers.IronBackpacksHelper.spawnEntityBackpack(IronBackpacksHelper.java:217)	at gr8pefish.ironbackpacks.events.ForgeEventHandler.onPlayerLogIn(ForgeEventHandler.java:127)	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_155_ForgeEventHandler_onPlayerLogIn_PlayerLoggedInEvent.invoke(.dynamic)	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:55)	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)	at net.minecraftforge.fml.common.FMLCommonHandler.firePlayerLoggedIn(FMLCommonHandler.java:555)	at net.minecraft.server.management.ServerConfigurationManager.initializeConnectionToPlayer(ServerConfigurationManager.java:175)	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.completeServerSideConnection(NetworkDispatcher.java:239)	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher.access$100(NetworkDispatcher.java:54)	at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:190)	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:289)	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:189)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:724)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:605)	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:250)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)	at java.lang.Thread.run(Unknown Source)