Hey, at first I want to say, that my English isn't really god. I understand almost everything, but I have still some problems with talking English, so please excuse my language mistakes .

 

My Problem is, that since i have installed Forge, I get an Error when I try to run the "startclient.bat" :

 

[09:18:04] Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/src/GuiScreen
[09:18:04]      at java.lang.Class.getDeclaredFields0(Native Method)
[09:18:04]      at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
[09:18:04]      at java.lang.Class.getDeclaredField(Class.java:1880)
[09:18:04]      at Start.main(Start.java:12)
[09:18:04] Caused by: java.lang.ClassNotFoundException: net.minecraft.src.GuiScreen
[09:18:04]      at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
[09:18:04]      at java.security.AccessController.doPrivileged(Native Method)
[09:18:04]      at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[09:18:04]      at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
[09:18:04]      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[09:18:04]      at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
[09:18:04]      ... 4 more
'"C:\Program Files\Java\jdk1.6.0_21\bin\java" -Xincgc -Xms1024M -Xmx1024M -cp "..\bin\minecraft;..\li...' failed : 1
FATAL ERROR
Traceback (most recent call last):
File "runtime\startclient.py", line 30, in startclient
File "D:\Spiele\mc\MCP\mcp62 Forge\runtime\commands.py", line 1064, in startclient
   self.runmc(forkcmd)
File "D:\Spiele\mc\MCP\mcp62 Forge\runtime\commands.py", line 1104, in runmc
   raise CalledProcessError(process.returncode, forkcmd, output)
CalledProcessError: Command '"C:\Program Files\Java\jdk1.6.0_21\bin\java" -Xincgc -Xms1024M -Xmx1024M -cp "..\bin\minecr
aft;..\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

 

As far as I understand it, the problem is, that the GuiScreen.java is missing, but I've checked that, its´defnitly there.

I´ve got no idea what else could be the Problem, so could somone please help me?

Post a log of recompile

Client:

src\minecraft\net\minecraft\src\ModLoader.java:387: type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object

        return ReflectionHelper.getPrivateValue(instanceclass, instance, fieldindex);

                                               ^

src\minecraft\net\minecraft\src\ModLoader.java:401: type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object

        return ReflectionHelper.getPrivateValue(instanceclass, instance, field);

                                               ^

Note: Some input files use unchecked or unsafe operations.

Note: Recompile with -Xlint:unchecked for details.

2 errors

 

Server:

src\minecraft_server\net\minecraft\src\ModLoader.java:371: type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object

        return ReflectionHelper.getPrivateValue(instanceclass, instance, fieldindex);

                                               ^

src\minecraft_server\net\minecraft\src\ModLoader.java:385: type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object

        return ReflectionHelper.getPrivateValue(instanceclass, instance, field);

                                               ^

Note: Some input files use unchecked or unsafe operations.

Note: Recompile with -Xlint:unchecked for details.

2 errors

Update your JDK.

thx, it works now.