[18:39:49] [Client thread/FATAL]: Exception caught executing FutureTask: java.util.concurrent.ExecutionException: java.lang.NullPointerException
java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_40]
    at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_40]
    at net.minecraftforge.fml.common.FMLCommonHandler.callFuture(FMLCommonHandler.java:710) [FMLCommonHandler.class:?]
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1011) [Minecraft.class:?]
    at net.minecraft.client.Minecraft.run(Minecraft.java:345) [Minecraft.class:?]
    at net.minecraft.client.main.Main.main(Main.java:117) [Main.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_40]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]
    at net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source) [start/:?]
    at GradleStart.main(Unknown Source) [start/:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_40]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_40]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_40]
    at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_40]
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140) [idea_rt.jar:?]
Caused by: java.lang.NullPointerException
    at net.minecraft.network.play.server.S0CPacketSpawnPlayer.func_148944_c(S0CPacketSpawnPlayer.java:84) ~[S0CPacketSpawnPlayer.class:?]
    at net.minecraft.client.network.NetHandlerPlayClient.handleSpawnPlayer(NetHandlerPlayClient.java:503) ~[NetHandlerPlayClient.class:?]
    at net.minecraft.network.play.server.S0CPacketSpawnPlayer.processPacket(S0CPacketSpawnPlayer.java:76) ~[S0CPacketSpawnPlayer.class:?]
    at net.minecraft.network.play.server.S0CPacketSpawnPlayer.processPacket(S0CPacketSpawnPlayer.java:92) ~[S0CPacketSpawnPlayer.class:?]
    at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:18) ~[PacketThreadUtil$1.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_40]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_40]
    at net.minecraftforge.fml.common.FMLCommonHandler.callFuture(FMLCommonHandler.java:709) ~[FMLCommonHandler.class:?]
    ... 16 more