i am trying to set up a new minecraft server on version 1.5.2

i am using the recommended build (minecraftforge-installer-1.5.2-7.8.1.737) and its working just fine on client side

but on server side its not

after starting the installer, selecting an empty folder, extracting everything and launching the .jar file

i get "a java exception has occurred"

 

i proved that i am not making a general mistake by trying the exact same procedure for 1.6.2 and 1.6.4 which are both working like they should

but as one of my favorite mods is just available for 1.5.2 some help or ideas would be appreciated

 

extended error message:

The filename, directory name, or volume label syntax is incorrect.

Exception in thread "main" java.lang.NoClassDefFoundError: ab

        at java.lang.ClassLoader.defineClass1(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.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 sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Caused by: java.lang.ClassNotFoundException: ab

        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)

        ... 13 more

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1.5.2 is no longer supported. Update to 1.6 or solve your own problems.