I have been running my server on my 64bit windows for a bit now and just now I tried to change it my another computer 32bit. I change the code from 64bit to 32bit I transfered everything over to my PC and I keep getting this error.. Exception in thread "main" java.lang.UnsupportedClassVersionError: org/bukkit/cr aftbukkit/Main (Unsupported major.minor version 49.0) 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) Press any key to continue . . . Any help? --- merged: Jan 21, 2011 7:38 PM --- Didn't really explain it very well.. Okay so I was running the server on a 64bit PC, It was working fine on there.. I transfered it over to my 32bit PC and I get that error when running it I changed the code on the .bat file for a 32bit machine I'm running windows.