Building for iPad

I'm trying to build a project for iPhone and iPad. it works fine on iPhone, but can't finish installation on iPad, even using 3.2 setting target to iOS 3.2.

It returns a Build Succeeded but when I try to Run, I receive:

Uncaught Exception: -[PBXDebugScriptCommand debugSessionDidStart:]: unrecognized selector sent to instance 0x20191ffc0

Stack Backtrace: The stack backtrace has been logged to the console.

It keeps showing the message installing on Device but never finishes.

Any idea what could it be?

Thanks in advance.