Spark error

Hi,

I am using ubuntu 6.06LTS server.

I reinstalled jdk1.5 there after i get error in Spark like This

java.lang.UnsupportedClassVersionError: org/jivesoftware/launcher/Startup (Unsupported major.minor version 49.0)

at java.lang.ClassLoader.defineClass0(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:539)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)

at java.net.URLClassLoader.access$100(URLClassLoader.java:55)

at java.net.URLClassLoader$1.run(URLClassLoader.java:194)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:187)

at java.lang.ClassLoader.loadClass(ClassLoader.java:289)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)

at java.lang.ClassLoader.loadClass(ClassLoader.java:235)

at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)

at com.install4j.runtime.Launcher.main(Unknown Source)

Any ideas?