false error with smg light good for future readers

Hey guys. Today i pulled up in the drive way and after i parked the car it rolled back about a foot then locked into 1st gear, then i put the e-brake on and got out. i restarted the in 15 mins and the SMG light came on. I yelled o hell naw ur that picky that ur gonna cut on due to a rollback. So shifted back into "N" and then into first. Turned the car off and restarted and the light went out. I have driven for more than 30 miles and no light. POINT IS, these cars are touchy when it comes to the sensors but it doesnt always mean that theres a valid reason for the error.