Eclipse Juno for Java Developers Mac OS X not working

Hello Pro experts,
When I try to install Eclipse, I ended up with an error message. This error irritates me a lot. Why I am not able to proceed further with installation? Any way related to plugin. Do I need to update? Asking myself too many questions, please help me to solve this error. Thanks.

Avviso
Failed to find a Main Class in "/Users/Piero/ Documents/Universita/eclipse/Eclipse.app/Contents/MacOS//../../../
plugins/ org.eclipse.equinox.launcher_1.3.0.v20 120522-18 13.jar”.
OK
