freenet 7.5 wont work

I uninstalled freenet 7.4 then tried to install 7.5 and always get  
this error message.
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad  
version number in .class file
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:676)
	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$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:317)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:375)
chmod: lib/*: No such file or directory

please help! thank you!
-Andrew 
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