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Let's see if we can get this one sorted out.
It's possible that the chains may have damaged the wheel speed sensor on one of the wheels. To check you will need to remove the wheels that had chains on them (I'm assuming the front). Once you have the wheels off you should see a black wire running from the frame to the wheel hub just behind the brake rotor. You'll need to inspect that wire for damage.
Let me know what you see.
Please let me know if you need any additional info.
I just wanted to see if you need any additional assistance.