I'm not familiar with that bike specifically, but I'd suspect something awry with the front speed sensor - on many bikes it's mounted with the front caliper and has a small electrical cable attached, it goes next to a second front disk that's covered in slats and has to be quite close (some only sit on the side, others have to go around it on both sides.
It would be easy to knock the sensor while remounting the wheel, and if it's broken would cause all the errors you're seeing.
Edit: if it's broken you can still ride the bike just fine, if you have a GPS use that for speed and ride in a manner where you don't need ABS to kick in (I don't know, I've never had a bike with ABS)
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