Код:

== MCP 7.51 (data: 7.51, client: 1.5.2, server: 1.5.2) ==
> Searching for javac.exe in C:\Program Files
[10:44:01] Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/util/MinecraftError
[10:44:01] 	at java.lang.Class.getDeclaredFields0(Native Method)
[10:44:01] 	at java.lang.Class.privateGetDeclaredFields(Class.java:2397)
[10:44:01] 	at java.lang.Class.getDeclaredField(Class.java:1946)
[10:44:01] 	at Start.main(Start.java:17)
[10:44:01] Caused by: java.lang.ClassNotFoundException: net.minecraft.util.MinecraftError
[10:44:01] 	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
[10:44:01] 	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
[10:44:01] 	at java.security.AccessController.doPrivileged(Native Method)
[10:44:01] 	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
[10:44:01] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
[10:44:01] 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
[10:44:01] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
[10:44:01] 	... 4 more
'"C:\Program Files\Java\jdk1.7.0_55\bin\java" -Xincgc -Xms1024M -Xmx1024M -cp "..\bin\minecraft;..\sr...' failed : 1
FATAL ERROR
Traceback (most recent call last):
  File "runtime\startclient.py", line 30, in startclient
  File "C:\Pylo\mcp\runtime\commands.py", line 1162, in startclient
    self.runmc(forkcmd)
  File "C:\Pylo\mcp\runtime\commands.py", line 1202, in runmc
    raise CalledProcessError(process.returncode, forkcmd, output)
CalledProcessError: Command 
'"C:\Program Files\Java\jdk1.7.0_55\bin\java" -Xincgc -Xms1024M -Xmx1024M -cp "..\bin\minecraft;..\src\minecraft;..\lib;..\lib\*;..\jars\bin\minecraft.jar;..\jars\bin\jinput.jar;..\jars\bin\lwjgl.jar;..\jars\bin\lwjgl_util.jar" -Djava.library.path=..\jars\bin\natives Start' returned non-zero exit status 1