"Could not find the main class- program will close"

[Nathan2014]

Hey,

See this is a common problem but I cannot for the life of me fix it. Both the .exe and the .jar have the same errors, however sometimes the .exe will download and look like its doing something before it throws up this error.

Java version 7 update 51. and here is the info on the console after I logged in on the .jar.

Syncing Assets:
Java Path: C:\Program Files\Java\j2re1.4.2_19\bin\javaw.exe
Setting MinMemory to 256
Setting MaxMemory to 768
Defaulting PermSize to 256m
java.lang.UnsupportedClassVersionError: net/minecraft/launchwrapper/Launch (Unsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(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)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

Ill crack open the .exe and check the console info there.

Any help going would be appreciated :3

 

[Nathan2014]

Here the info from when it downloads onn the .exe
Logging in...
Login complete.
Unleashed
Downloading Mod Pack
Local: 1A489BF9AEF03B72C286678BACA9714A
Remote: 1A489BF9AEF03B72C286678BACA9714A
Mods Folder: C:\Users\Nathan\Downloads\Unleashed\minecraft\mods
Dynamic Folder: C:\Users\Nathan\AppData\Roaming\ftblauncher\ModPacks\Unleashed\minecraft\mods
dirs mk'd
debug: retaining modpack file: C:\Users\Nathan\AppData\Roaming\ftblauncher\ModPacks\Unleashed\Unleashed.zip
Loading Jar URLs
Downloading Jars
Extracting Files
Game update complete
Java Path: C:\Program Files\Java\j2re1.4.2_19\bin\javaw.exe
Setting MinMemory to 256
Setting MaxMemory to 768
java.lang.UnsupportedClassVersionError: net/ftb/mclauncher/MinecraftLauncher (Unsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(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)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)

 

[UniZero]

Your version of java that is listed in your log is over at least 2 years old. If you have the java 7 update 51 then the launcher is not using it.

Follow the basic troubleshooting guide linked below and follow it exactly as written. If you still need help then click the second link regarding logs.

http://desk.feed-the-beast.com/inde...ticle/View/54/0/basic-troubleshooting-updated
http://forum.feed-the-beast.com/threads/your-logs-and-you-what-you-need-to-know.36509/

 

[Nathan2014]

Seems to have fixed the issue.... old version still installed now removed and testing the program now.