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i'm trying to launch pixelmon, everything seems to be going well and then when i try to connect to a server or create a world i am greeted with the loading screen except this one doesn't have any text or anything eventually it says minecraft forge 1.10.2(not responding) can anyone help?

---- Minecraft Crash Report -------- Minecraft Crash Report ----// Would you like a cupcake?
Time: 6/21/17 5:15 PMDescription: There was a severe problem during mod loading that has caused the game to fail
net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Pixelmon (pixelmon)Caused by: java.lang.NoSuchMethodError: com.pixelmonmod.pixelmon.items.PixelmonItemBlock.func_77655_b(Ljava/lang/String;)Lnet/minecraft/item/ItemBlock; at com.pixelmonmod.pixelmon.items.PixelmonItemBlock.<init>(PixelmonItemBlock.java:54) at com.pixelmonmod.pixelmon.config.PixelmonItems.load(PixelmonItems.java:449) at com.pixelmonmod.pixelmon.config.PixelmonConfig.loadConfig(PixelmonConfig.java:456) at com.pixelmonmod.pixelmon.config.PixelmonConfig.init(PixelmonConfig.java:448) at com.pixelmonmod.pixelmon.Pixelmon.preInit(Pixelmon.java:102) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:641) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) at com.google.common.eventbus.EventBus.post(EventBus.java:275) at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:246) at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:224) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) at com.google.common.eventbus.EventBus.post(EventBus.java:275) at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:147) at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:628) at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:268) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:440) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:352) at net.minecraft.client.main.Main.main(SourceFile:124) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
-- System Details --Details: Minecraft Version: 1.11.2 Operating System: Windows 10 (x86) version 10.0 Java Version: 1.8.0_131, Oracle Corporation Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation Memory: 133638016 bytes (127 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB) JVM Flags: 10 total; -XX:HeapDumpPath=ThisTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -Xms256M -Xmn128M -XX:+UseConcMarkSweepGC -XX:-UseAdaptiveSizePolicy -XX:+CMSParallelRemarkEnabled -XX:+ParallelRefProcEnabled -XX:+CMSClassUnloadingEnabled -XX:+UseCMSInitiatingOccupancyOnly IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP 9.38 Powered by Forge 13.20.0.2228 5 mods loaded, 5 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored UCH minecraft{1.11.2} [Minecraft] (minecraft.jar) UCH mcp{9.19} [Minecraft Coder Pack] (minecraft.jar) UCH FML{8.0.99.99} [Forge Mod Loader] (forge-1.11.2-13.20.0.2228.jar)