Android Conversion to Dalvik format failed with error 1

This is a follow up question to this question: "Conversion to Dalvik format failed with error 1" on external JAR

I got an Android project using Eclipse. When trying to run the application I get this error:

[2016-11-03 12:12:50 - MyProject] Dx unsupported class file version 52.0 ...while parsing android/UnusedStub.class

[2016-11-03 12:12:50 - MyProject] Dx 1 error; aborting

[2016-11-03 12:12:50 - MyProject] Conversion to Dalvik format failed with error 1

I read that it might be a JRE issue but I'm using jre 7 and set the Java compiler in the project's properties to work with compliance to JavaSe-1.7.

What could be the problem?

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