These guys gave you the reason why is failing but not how to solve it. This problem may appear even if you have a jdk which matches JVM which you are trying it into.
Project -> Properties -> Java Compiler
Enable project specific settings.
Then select Compiler Compliance Level to 1.6 or 1.5, build and test your app.
Now, it should be fine.
~ Answered on 2012-06-29 15:43:47