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Thanks guys, I think the problem is 1.6 vs 1.5. I'll wait... I think.

Hi guys, I need help on Java. I have a Macbook (10.4). When I try to open a .jar file, I got a message like: can't open... In the Console, the error message is: Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file I googled it and it seem...