Unsupported major.minor version 52.0 comes when you are trying to run a class compiled using Java 1.8 compiler into a lower JRE version e.g. JRE 1.7 or JRE 1.6. Simplest way to fix this error is install the latest Java release i.e. Java 8 and run your program.
Read more: http://javarevisited.blogspot.com/2015/05/fixing-unsupported-majorminor-version.html#ixzz4AVD4Evgv
