Normally this means that the BLTouch doesn’t seem to be behaving.
Have you checked the wiring according to the FAQ?
https://discourse.crc.id.au/t/ender-3-v2-frequently-asked-questions/17#heading--bltouch
As a rule of thumb, if the probe is deploying, but then errors, the problem is with the black/white wires.
If the probe never deploys, the problem is with the group of 3 wires that carry the control signals and power to the BLTouch (or compatible) probe.