Collectible Card Game Headquarters

Attempted to upgrade launcher multiples times on my macbook pro from 0.3.4 to 0.3.6 and after doing so and trying to launch 0.3.6 I receive a message:

The Java JAR file "XMageLauncher-0.3.6.jar" could not be launched.
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Any ideas?

Launcher 0.3.6 needs java 8 other than 0.3.4.

So probably the used java is not up-to-date.

Look here for some java update information on mac:
viewtopic.php?f=70&t=13632&p=161570#p161570