TPMS Light After Replacing Front Rotors and Pads

Unless you banged the rim by the valve, you couldn't have damages it. It's inside the tire.
Maybe you have a tire that is low? Check your tire pressures, while cold and adjust as needed.
Then press the start button without pressing the brake pedal. Press and hold the reset button
under the steering wheel and watch the icon on the dash. It should flash a few times then go out.

 

My TPMS light blinks and then goes solid when I put on my winter tires (which has no sensors). The sensors are inside behind the air valve stem of the tire.

Did you check your tire pressure? I think the spare tire has a sensor too, so check its pressure as well. I also recall there is a TPMS reset button somewhere.

If all else fails, I am guessing you may have a faulty TPMS sensor in one of your tires. The batteries inside them eventually die. If you have techstream you can see the pressure reading coming from the tires to narrow down your search.