I dont know what to do anymore. I uninstalled java (reinstall) and i did the same thing with jd2. Nothing helped

org.jdownloader.update.launcher.JDLauncherFailedException: java.lang.NoClassDefFoundError: de/javasoft/plaf/synthetica/SyntheticaLookAndFeel
	at org.jdownloader.update.launcher.SecondLevelLauncher.launchJDownloader(SecondLevelLauncher.java:601)
	at org.jdownloader.update.launcher.SecondLevelLauncher.init(SecondLevelLauncher.java:464)
	at org.jdownloader.update.launcher.SecondLevelLauncher.runMain(SecondLevelLauncher.java:267)
	at org.jdownloader.update.launcher.JDLauncher.main(JDLauncher.java:19)
	at jd.Main.main(Main.java:8)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
	at com.exe4j.runtime.WinLauncher.main(Unknown Source)
	at com.install4j.runtime.launcher.WinLauncher.main(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: de/javasoft/plaf/synthetica/SyntheticaLookAndFeel
	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 jd.gui.swing.laf.LookAndFeelController.<clinit>(LookAndFeelController.java:38)
	at org.jdownloader.startup.Main.<clinit>(Main.java:63)
	at org.jdownloader.update.launcher.SecondLevelLauncher.launchJDownloader(SecondLevelLauncher.java:582)
	... 11 more
Caused by: java.lang.ClassNotFoundException: de.javasoft.plaf.synthetica.SyntheticaLookAndFeel
	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)
	... 26 more

ty in advance

[Lram32]

There are several threads about this topic. Please, read this: http://board.jdownloader.org/showthread.php?t=47100

ok, ty but u linked my own thread in your post. or lets just say i am always redirected to my own thread. could tell me what i should looking for in the forum? which error e.g keywords for the forum search

[Lram32]

lol.. sorry, I edited my previous post and linked the correct post.