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Hi. I didn't really know what category to put this under, because none of the ones under the modpack section really applied to this, so here is my post.

I am having issues with my Feed The Beast modpack. It is a custom modpack made by my friend, and every time I launch it, it crashes. I dont know why and I need help. Here is the crash report:

Minecraft Crash Report ----Minecraft Crash Report ----// Shall we play a game?
Time: 7/30/17 4:32 PMDescription: Initializing game
java.lang.NoClassDefFoundError: net/minecraft/client/renderer/texture/TextureMap at fastcraft.a.j.<clinit>(F:844)

at fastcraft.Hooks.j(F:90)

at net.minecraft.client.renderer.texture.DynamicTexture.func_110564_a(DynamicTexture.java)

at net.minecraft.client.renderer.texture.TextureUtil.<clinit>(TextureUtil.java:460)

at net.minecraft.client.shader.Framebuffer.func_147605_b(Framebuffer.java:104)

at net.minecraft.client.shader.Framebuffer.func_147613_a(Framebuffer.java:56)

at net.minecraft.client.shader.Framebuffer.<init>(Framebuffer.java:37)

at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)

at net.minecraft.client.main.Main.main(SourceFile:148)

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)Caused by: java.lang.ClassNotFoundException: net.minecraft.client.renderer.texture.TextureMap

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source) ... 16 more

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
-- Head --Stacktrace: at fastcraft.a.j.<clinit>(F:844) at fastcraft.Hooks.j(F:90)

at net.minecraft.client.renderer.texture.DynamicTexture.func_110564_a(DynamicTexture.java)

at net.minecraft.client.renderer.texture.TextureUtil.<clinit>(TextureUtil.java:460)

at net.minecraft.client.shader.Framebuffer.func_147605_b(Framebuffer.java:104)

at net.minecraft.client.shader.Framebuffer.func_147613_a(Framebuffer.java:56)

at net.minecraft.client.shader.Framebuffer.<init>(Framebuffer.java:37)

at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
-- Initialization --Details:Stacktrace: at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)

at net.minecraft.client.main.Main.main(SourceFile:148)

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)

java.lang.NoClassDefFoundError: net/minecraft/client/renderer/texture/TextureMap at fastcraft.a.j.<clinit>(F:844)
at fastcraft.Hooks.j(F:90)

It looks like the mod 'fastcraft' is causing the error to me. Try updating or removing that mod.