Olá pessoal, alguém sabe o que pode ser o erro abaixo? Alguém já passou por esse erro?
Fica parado no splashscreen -> Loading…core
Aguardo sugestões e agradeço desde já 
moises@lab-athlon:/opt/netbeans-5.0/bin$ ./netbeans
java.lang.NoClassDefFoundError: org/openide/ErrorManager
at java.lang.ClassLoader.defineClass2(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:719)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:160)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:254)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.netbeans.ProxyClassLoader.loadInOrder(ProxyClassLoader.java:576)
at org.netbeans.ProxyClassLoader.smartLoadClass(ProxyClassLoader.java:525)
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:157)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at org.openide.util.lookup.MetaInfServicesLookup.search(MetaInfServicesLookup.java:230)
at org.openide.util.lookup.MetaInfServicesLookup.beforeLookup(MetaInfServicesLookup.java:85)
at org.openide.util.lookup.AbstractLookup$R.beforeLookup(AbstractLookup.java:1021)
at org.openide.util.lookup.ProxyLookup$R.myBeforeLookup(ProxyLookup.java:538)
at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:405)
at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:380)
at org.openide.ErrorManager$DelegatingErrorManager.initialize(ErrorManager.java:703)
at org.openide.ErrorManager.getDefaultDelegate(ErrorManager.java:247)
at org.openide.ErrorManager.getDefault(ErrorManager.java:240)
at org.openide.util.RequestProcessor.logger(RequestProcessor.java:377)
at org.openide.util.Task.notifyRunning(Task.java:168)
at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:540)
at org.netbeans.core.startup.TopLogging$StreamDemultiplexor.flushLog(TopLogging.java:307)
at org.netbeans.core.startup.TopLogging$StreamDemultiplexor.write(TopLogging.java:282)
at java.io.PrintStream.write(PrintStream.java:412)
at sun.nio.cs.StreamEncoder$CharsetSE.writeBytes(StreamEncoder.java:336)
at sun.nio.cs.StreamEncoder$CharsetSE.implFlushBuffer(StreamEncoder.java:404)
at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:115)
at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:169)
at java.io.PrintStream.write(PrintStream.java:459)
at java.io.PrintStream.print(PrintStream.java:602)
at java.io.PrintStream.println(PrintStream.java:739)
at org.netbeans.core.startup.TopLogging.<init>(TopLogging.java:103)
at org.netbeans.core.startup.CLIOptions.initialize(CLIOptions.java:199)
at org.netbeans.core.startup.Main.start(Main.java:288)
at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:90)
at java.lang.Thread.run(Thread.java:595)
