Park brake no available

[Amie H]

I have a 2021 Corolla Le I hard to replace the rear caliper as one side was sticking. After I drove it and made three stops a warning appeared on my message screen park brake unavailable so we did the EPB reset and I cleared only to come back the next day, we have disconnected the Battery for 10 minutes only for it to come back on. All brakes are working properly. So I'm not sure what to do next. I seen something about Techstream to clear the brake memory but unsure if that's going to work. Anyone else have this same issue any advice would be appreciated. Thanks 

[flash22]

more than likely it wants a zero-point calibration, I take it the brakes were in service mode before doing the work

[Amie H]

I am assuming my mechanic did that.