ABS warning light on after wheel hub change

[cyberfruits]

Hi
I changed my front passenger side wheel hub bearing with

build in abs sensor on my zafira b 2013.
After i done the job the abs light come on after a test drive, i

then put back the old wheel hub and after a test drive the abs

light went off. So i send the new hub back and waiting for a

replacement one.has any body got any idea why the abs light

did come on with the new hub? could they supplying me with

the wrong hub or is it just faulty?

Thanks