Minecraft Forums

So I'm in need of help. Well my mistake happens when starting the minecraft Launcher. And I still do not understand anything, but I put to see the generated logs and came the error. If you can help me I would be very grateful.
And I do not know how to create a spoiler

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LaunchWrapper
A critical problem occurred registering the ASM transformer class fastcraft.asm.FastCraftTransformer
java.lang.ClassNotFoundException: fastcraft.asm.FastCraftTransformer
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at net.minecraft.launchwrapper.LaunchClassLoader.registerTransformer(LaunchClassLoader.java:88)
at cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:108)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)






game
Exception in thread "main" <log4j:Event logger="STDERR" timestamp="1504547566572" level="INFO" thread="main">
<log4j:Message><![CDATA[[java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.NoSuchMethodError: fastcraft.a.b()V]]></log4j:Message>
</log4j:Event>


11:52:46
monitor
expected <