I installed the new dev-version of minecraft forge following this tutorial: http://www.minecraftforge.net/forum/index.php/topic,14048.0.html After setting everything up as described in the tutorial I get this error:

 

[04:10:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[04:10:52] [main/INFO]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[04:10:52] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker
[04:10:52] [main/INFO]: Forge Mod Loader version 7.2.44.991 for Minecraft 1.7.2 loading
[04:10:52] [main/INFO]: Java is Java HotSpot(TM) Client VM, version 1.6.0_26, running on Windows 7:x86:6.1, installed at C:\Program Files (x86)\Java\jre6
[04:10:52] [main/INFO]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
[04:10:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[04:10:52] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker
[04:10:52] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[04:10:52] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker
[04:10:52] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[04:10:53] [main/ERROR]: The binary patch set is missing. Either you are in a development environment, or things are not going to work!
[04:10:54] [main/ERROR]: The minecraft jar file:/C:/Users/Carbon/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.0.991/forge-1.7.2-10.12.0.991-mcp.jar!/net/minecraft/client/ClientBrandRetriever.class appears to be corrupt! There has been CRITICAL TAMPERING WITH MINECRAFT, it is highly unlikely minecraft will work! STOP NOW, get a clean copy and try again!
[04:10:54] [main/ERROR]: FML has been ordered to ignore the invalid or missing minecraft certificate. This is very likely to cause a problem!
[04:10:54] [main/ERROR]: Technical information: ClientBrandRetriever was at jar:file:/C:/Users/Carbon/.gradle/caches/minecraft/net/minecraftforge/forge/1.7.2-10.12.0.991/forge-1.7.2-10.12.0.991-mcp.jar!/net/minecraft/client/ClientBrandRetriever.class, there were 0 certificates for it
[04:10:54] [main/ERROR]: FML appears to be missing any signature data. This is not a good thing
[04:10:54] [main/INFO]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper
[04:10:54] [main/INFO]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker
[04:10:54] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[04:10:57] [main/ERROR]: Unable to launch
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_26]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.6.0_26]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.6.0_26]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.6.0_26]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
Caused by: joptsimple.MissingRequiredOptionException: Missing required option(s) ['accessToken']
at joptsimple.OptionParser.ensureRequiredOptions(OptionParser.java:447) ~[OptionParser.class:?]
at joptsimple.OptionParser.parse(OptionParser.java:437) ~[OptionParser.class:?]
at net.minecraft.client.main.Main.main(Main.java:44) ~[Main.class:?]
... 6 more

when trying to launch with the default ExampleMod.

Add --accessToken whatever to your program args