VAVA Home Cam: ex usb accessories may not be supported

vava home cam : a voice says:
“ex usb accessories may not be supported please remove it immediately”
but there is nothing plugged in USB !
Any suggestions?

We regret to hear you are having issues with your VAVA Home Cam unit. Would you be so kind to try the following steps to see if it solves the issue?
Factory reset the home cam base and cameras, then pair it with the camera again. Kindly check the firmware version. Thank you!