Jackie,
The OS isn't a problem, but don't know your phone or carrier.
I'm runnig the app fine on Mobile 6.
Ignore those errors on install. I had them too.
Make sure you install on the device not on a storage card
See the great response to my similar query on this board and walk through the steps:
http://app.fitsync.com/forum/index.php/topic,27.0.htmlIf you continue to have specific errors or problems, please post the exact problem and error text.
The support folks here are great.
Good luck.

Charles