java.lang.UnsupportedClassVersionError Unsupported major.minor version 51.0 [duplicate]

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.

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