SV06: Z level indication is blinking

Hello, this is the second sv06 we have, and we have already assembled it, leveled the bed, set the probe offset, and did all the bed leveling setups. When I send the gcode to the printer, the printer just dosent print at all, and on the screen, the recorded z axis value shows a blinking ?? even after homing and leveling. this isnt a problem with my other sv06, which works as intended. Has anyone had this problem before? If so, how did you fix the printer?

Have not heard of this problem before, just wondering if you are sending the Printing file/G-Code through a Computer/Laptop or are you using the little SD Card to Print from ?

I was using a micro sd card to transfer the files.