Hi i am using an iPhone under the 3.0 OS and it was working fine with me using it as the device in Xcode and then i recently tried to build and run an application and it said
"Error starting executable.
no provioned iPhone OS device is connected"

and in the Organizer it says "Could not support development."

so do i need to restore my phone and start over or is there something i can do??

iPhone OS 3.0 is under NDA and may not be discussed.

You can discuss it at devforums.apple.com. But not here.

power off the iPhone and restart xcode