SQLite error code

Hi to all Professionals
I'm new (beginner) to the forum as well to the writing Xcode / Objectiv-C language. I have followed example from the book "DataBase Application Programming" by PATRICK ALESSI to build a simple Database and then display data using UITABLEView; Xcode reported "Build succeeded" and then the iphone simulator popped-up but nothing displayed (a disappointing white blank screen with dotted lines) I looked at the Debugger Console and there's cryptic message:
"Problem with Database"
"21"
"Terminating in response to Springboard termination"
Is this a Message error code reported by SQLite? How do I find what's meaning of code 21 ?
Any idea to help translate the error ? or where to look up ?

Many Thanks for your Input