My dish has the error from that same positioner, then it kicks in and goes, never skipping a beat after erroring out a couple times. Even after running the dish to both ends manually with no binding and not losing any positions, I have the same problem.
I've wondered (connections all checked) if the power supply goes weak and maybe stops the initial "oomph" needed to move the dish, thus it EXPECTS a pulse but the dish isn't moving.....and the error sees no movement. (just my theory.)
maybe even "caps" going bad....thinking of trying the Titanium positioner, bet it runs better! I've got under 100 feet of new cable, a rotary encoder for the pulsing, and same issue, cold or warm weather. Actually playing with the system later today. Going to swap motors to see if current draw is too high.