Replaced front wheel bearing, got a problem! Options

[J-TYPE]

hi, i took my car to the shop earlier today and had my front/left wheel bearing and seals replaced. once the job was done and ready to leave, i noticed the ABS light was ON when the car is running. i'm pretty sure it came on after the mechanic did his job so i told him and he said to drive around for awhile and it'll turn off, so that's what i did. after driving around the ABS light still didn't turn off. anyways, i was wondering if anyone has had this problem with the ABS light staying on after replacing a wheel bearing and can point out what could be the problem so then i wouldn't have to waste my time bringing my car back to the shop and let the mechanic waste my time to diagnose the problem... thanks!