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What make and model is your car? Something got mixed up and it's showing a Honda Mini?
If one pad is worn more than the other that usually indicates a problem with the caliper or the caliper slides. If the outside pad is more worn then that means the slides weren't properly lubricated when the brake pads were installed, or the slides were bent in the replacement process. I've seen techs bend them by using the wrong tool to compress the caliper piston upon replacement.
If the pad is so badly worn that there was a lot of metal generated then it's very possible that the error light you are getting is because of the metal interfering with the speed sensor on that wheel.
Do you plan to fix it yourself?
Check to make sure those slides are straight and greased, but not so much grease that they can't slide inside the caliper openings.
Then make sure the little rubber sleeve on the slide (sometimes on one, sometimes on both) isn't torn or damaged.
When you changed the pads did you remove the wheel speed sensor and look for metal filings? It's mounted in the hub and has a magnet on it so it tends to collect metal.
If the speed sensor looks ok then you should try disconnecting the battery for about 5 minutes (make sure you know the radio security code) and it will clear the codes out. If they set again right away then you will need to figure out what is triggering the fault. This can be done with a scan tool.