Is there a battery on the main board to keep settings? I think there is. Perhaps your battery is dead.
Did you recently turn off the power?
Yes, top left that looks like a battery holder.
You most likely did not do the procedure correctly. The video outlines the process perfectly. I would suggest you try it again. It is very important that the printhead is locked in place for the "Move to Cap Pos" step , as shown at the 55 sec - 1 min point. If you can move it to the left at all, then it will give you the error you received. Keep trying to lock the head in place before pressing Enter.