Googling for "jar preverification failed" gives some ideas:
- there might be some old class files, try a clean build - the path to the jdk isn't configured correctly - you are using an obfuscator which is creating invalid class files
Does that give you some ideas on what to look for?
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus