theft system on 1997 Cadillac Seville SLS

When car is started, the DIC says thet there is a problem with the theft system car may not re-start. What is up withg this?

Here is some info about this system:
Never had a problem with restart though.
1 more answer
I had the same problem on my 96 DeVille. they replaced the ign. switch. My key has a chip on it. If your key has a chip the switch may be the problem. Good luck