---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 23.07.15 19:33
Description: Initializing game

java.lang.NoSuchMethodError: buildcraft.api.core.EnumColor.setIconArray([Lnet/minecraft/util/IIcon;)V
at buildcraft.core.ItemPaintbrush.func_94581_a(ItemPaintbrush.java:76)
at net.minecraft.client.renderer.texture.TextureMap.func_110573_f(TextureMap.java:464)
at net.minecraft.client.renderer.texture.TextureMap.(TextureMap.java:87)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:547)
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)
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.k773.GameStarter.newstart(Unknown Source)
at net.k773.Auth.start(Unknown Source)
at net.k773.Auth.auth(Unknown Source)
at net.k773.gui.Listener$3.run(Unknown Source)

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

-- Head --
Stacktrace:
at buildcraft.core.ItemPaintbrush.func_94581_a(ItemPaintbrush.java:76)
at net.minecraft.client.renderer.texture.TextureMap.func_110573_f(TextureMap.java:464)
at net.minecraft.client.renderer.texture.TextureMap.(TextureMap.java:87)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:547)

-- 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)
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)

One of your mod APIs is outdated. Update your mods.