Don't listen to the other guy here as you don't have to bleed when you push the pistons back. When the orange ABS and red brake lights come on, it indicates that the ABS module has detected a problem in the sensor strings or other circuits it monitors. Most likely you damaged one or both of the front sensors or wiring to them when you were doing the work. First thing to do is to look at the wiring and sensors for damage as if they are you most likely have found what is wrong. If you can't see anything, go get the codes red with a scanner and diagnose from there.
if you pushed the piston back in the caliper without loosening the bleeder valve it pushed back pressure on the system and that will cause both lights to come on,you may also notice it not stopping as well as it did before,to fix this you may have to bleed the front brakes out,id also make sure i didn't knock any of the sensor wires off in the front or damage any of the wires for the front sensors,good luck with it.