Mac Installation Error

I've tried installing multiple versions of Robocode on my mac, which is running OSX 10.8.2, and I keep getting the same error message: "Installation failedjava.io.FileNotFoundException: /Users/ashandrien/robocode/javadoc/allclasses-frame.html (Not a directory). Not sure why this is happening. I navigated to the folder which the .jar file was in and used the sudo command: "sudo java -jar (name of file)", but still got the same error. I have the latest version of JDK and Java as well.