Some time you will face this message at home page after imported demo data. This because slider haven't set on the home page slide widget properly.

So please click on the message "Oops..." field then you will see the Slider Revolution widget at left sidebar.

Please click on "SELECT MODULE" after click on this button it will open a popup window with slider list, then please select slider from there.

If you couldn't see the slider on the popup window then please create ticket we will send you slider file to import it.