Server crashes while starting.

Forge Mod Loader version 13.20.0.2214
Minecraft 1.11.2
Levels 2 version 0.1.0.0

[20:21:49] [Server thread/ERROR] [FML/]: Caught exception from Levels (levels) java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP at com.thexfactor117.levels.init.ModEvents.registerEvents(ModEvents.java:24) ~[ModEvents.class:?] at com.thexfactor117.levels.Levels.preInit(Levels.java:57) ~[Levels.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_111] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_111] at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:641) ~[forge-1.11.2-13.20.0.2214-universal.jar:?] at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_111] at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[minecraft_server.1.11.2.jar:?] at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:246) ~[forge-1.11.2-13.20.0.2214-universal.jar:?] at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:224) ~[forge-1.11.2-13.20.0.2214-universal.jar:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_111] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_111] at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_111] at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) ~[minecraft_server.1.11.2.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:275) ~[minecraft_server.1.11.2.jar:?] at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:147) [LoadController.class:?] at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:628) [Loader.class:?] at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:100) [FMLServerHandler.class:?] at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:331) [FMLCommonHandler.class:?] at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:121) [lh.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:442) [MinecraftServer.class:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_111] Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111] ... 33 more Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@463b4ac8 from coremod FMLCorePlugin at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:257) ~[forge-1.11.2-13.20.0.2214-universal.jar:?] at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111] ... 33 more Caused by: java.lang.RuntimeException: Attempted to load class bps for invalid side SERVER at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:56) ~[forge-1.11.2-13.20.0.2214-universal.jar:?] at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:253) ~[forge-1.11.2-13.20.0.2214-universal.jar:?] at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279) ~[launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111] at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_111] ... 33 more [20:21:50] [Server thread/WARN] [FML/]: Can't revert to frozen GameData state without freezing first. [20:21:50] [Server thread/TRACE] [minecraft/minecraft]: Sending event FMLServerStoppedEvent to mod minecraft [20:21:50] [Server thread/TRACE] [minecraft/minecraft]: Sent event FMLServerStoppedEvent to mod minecraft

Looking into it now. Thanks for the report!

Should be fixed in 0.1.0.1