my k1 max keep flashing { blanking }

Hi all, can any one help with this please,
i calibrate ready for printing. but soon as i go to print the this flashes up then stops, and is saying filamnet runout, also is worked fine untill i upgraded to CFS and done the laset update. i’ve check the filament sensor and its fine, i can feed filamnet throw all fine, ive even put it back to stock, but stll shows this,