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That message usually means that the security system did not read the resistor pellet that is embedded in your key correctly. There are a few things that can cause this.
One is that the contacts on the key are dirty and need to be cleaned. alcohol works well!
The other is that the little contacts in the ignition cylinder are dirty or worn. For the most part, removing the key and reinserting it back in the ignition corrects the problem. If you don't remove the key and reinsert it like the message asks, when you try to move the car, the engine will STALL!!
The security system cuts off the fuel and kills the engine.
Hopefully, it's just a dirty resistor pellet. If you have a second key, give that one a try.