---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 16. 3. 6 오전 8:53
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Unknown Source)
 at cpw.mods.fml.common.Loader.identifyMods(Loader.java:340)
 at cpw.mods.fml.common.Loader.loadMods(Loader.java:489)
 at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:87)
 at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:319)
 at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:176)
 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:631)
 at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.gui.GuiScreen
 at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 ... 9 more
Caused by: java.lang.RuntimeException: Attempted to load class bdw for invalid side SERVER
 at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:51)
 at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
 at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
 ... 11 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
 Minecraft Version: 1.7.10
 KCauldron Version: pw.prok:KCauldron:1.7.10-1614.200 Official
 Plugins: ~~ERROR~~ NullPointerException: null
 Disabled Plugins: ~~ERROR~~ NullPointerException: null
 Operating System: Windows 7 (x86) version 6.1
 Java Version: 1.8.0_73, Oracle Corporation
 Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
 Memory: 973018104 bytes (927 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
 JVM Flags: 2 total; -Xms1G -Xmx1G
 AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
 IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
 FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 4 mods loaded, 0 mods active
 States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
 

이렇게 뜨는데 어떻게 하나요?