Hey, just to let you guys know there is this error when running the game!
Double check that your build.xml has the source and target attribute on the "compile" task. It should be set like source=7 target=7. This should solve the problem!
Thank you! We are looking into it. From our tests we didn't encounter any problem while running the jar file on different machines but apparently we have missed something! /OwO'\
From the screenshot you provided it would appear your running an older version of java! I'm not sure if that might solve the problem, but you can always try to upgrade your JRE (to V62.0 or the newest release) :) If that is not the case or if it does not fix the problem then let me now <3