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The spoiler is a necessary piece for driving at speed. The warning light could be related to several things.
Each time you start the car, the system goes through a speed calibration test. The unit must know when you reached the speed threshold for extending the spoiler. This light will stay on until the car reaches 3-6mph, then should go off.
The Spoiler is fused and controlled by 2 relays. You fail to mention your MY, but the Fuse is D8 for the <'00 cars and D7 for the >'99 cars. For all, the extension relay is #3 (top row, 3rd from the left) and #9 (just below #3) in the #2 Relay Panel which lives in the Trunk.
Check fuses. Then check relays. The easiest way is to reverse them and see if you can now extend but not retract the spoiler. Unlikely that both relays are bad simultaeously, but possible. If this doesn't help, start thinking wheel mounted speed sensors (though I suspect you'd have other issues if these were the cause). I'm betting on the relays. Good Luck.
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