Tekkit server not starting up

[JammyBoy997]

Title: Tekkit server not starting up

Version: 3.1.2

OS: Mac 10.4.11 ppc

Java Version: 1.5.0_19 from Apple Computer, inc

Description of Problem:

When I try to start the server using start.command i get an error message in terminal.

Error Messages:

java.lang.UnsupportedClassVersionError: Bad version number in .class file

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:620)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)

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 sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)

at java.lang.ClassLoader.loadClass(ClassLoader.java:251)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)

Exception in thread "main" logout

[Process completed]

Error Log:

[JammyBoy997]

If i look in java preference the java version says J2SE 5.0 was unaware about which is the correct one