no home menu showing

Hi!
I have just received my picopix micro and planning to spend my Christmas with it.

I have fully charged the projector and turned it on.
however, I do not see the green home menu as every video is showing.
instead all I have is an exclamation mark and a sign of cable. i have tried to connect the projector to my window desktop but it doesn’t show.

i am able to access the side menu (to adjust pic/ eco mode) but nothing else.

please tell me what to do?

Thank you!