You could try to export it from C2 again with Universal selected next to Supported devices like this:
<img src="http://i42.tinypic.com/357r5n5.jpg" border="0" />
O'ya also remember in your C2 project settings window to give your game a name, description, and version number. The first time I used PhoneGap I kept on getting different errors because I didn't have them filled out.