Welcome to swffit discussion group !
You can find more information about swffit and download the files from swffit main page ( http://swffit.millermedeiros.com/ )
Before ask any question please read the swffit documentation ( http://swffit.millermedeiros.com/#api ) and see the example files that come inside the .zip file.
The best way to avoid bugs is using the example files that come inside the .zip file.
If you find any bug please make sure it isn't already fixed ( http://code.google.com/p/swffit/wiki/change_log ) or reported ( http://code.google.com/p/swffit/issues/list ) and check if it also happen in the example files.
Thanks for using swffit discussion group and for helping swffit improvement.