Java encounters error, cannot load Snaptu

Hi,
I use snaptu software in my Nokia X3 mobile. This has happened about 4-5 times in the last couple of weeks. I install snaptu fine (unsigned) reorder home screen to my apps etc, works fine for about 4-5 uses then get an error from Java when starting saying it encountered an error, doesn't say what.
If I uninstall and re-install snaptu again and keep my data I get same error, if I don't keep data it starts as if fresh install.
Anyone have any ideas?
