When I'm open Eclipse with the worspace eclipse into forge/mcp directory, on the workspace only appears Client and Server, with a lot of errors, and when I run Minecraft, on the console put this Crash Report:

 

Exception in thread "main" java.lang.NoClassDefFoundError: LCrashReport;

at java.lang.Class.getDeclaredFields0(Native Method)

at java.lang.Class.privateGetDeclaredFields(Unknown Source)

at java.lang.Class.getDeclaredField(Unknown Source)

at Start.main(Start.java:17)

Caused by: java.lang.ClassNotFoundException: CrashReport

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)

... 4 more

 

What happend? I tried decompiling minecraft only with forge or using mcp & forge too but always appear this Crash report

 

Sorry for my English, I'm Spanish

 

Easiest way to fix is to update to the latest forge, or you can delete mcp/eclipse and copy the mcp/forge/fml/eclipse folder to mcp/eclipse

No, it doesn´t work  , I tried also with the lastest version, and it doesn't work. Also I tried open minecraft with the mcp startclient.bat and appear an error too when the forge modloader was downloading. Whats the problem?

Did you try deleting your entire mcp folder and just downloading forge (not mcp), extracting it and running install.bat? From #444, forge downloads everything for you, and when it's done you can use the forge/mcp/eclipse workspace.