the following is returned when i choose forge and press play in my launcher. I followed all instructions to the letter but it didn't say what to do next. get the same problem whether i install as client or server as it's before minecraft loads and the single/multi player choice is available. I'm not stupid, just not been involved with anything like this before, no idea where to start.  :-\

 

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/Level

at net.minecraft.launchwrapper.Launch.launch(Launch.java:94)

at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Level

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

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

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

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

... 2 more

User was banned for using a cracked launcher.