O M G. sorry author, and thank you for helping a Noob.

i found the solution but as you replayed to delate the DEMO images, i have done that.
may be it is a Noob question, but i don’t know
“how to solve the error ‘img. file missing’ , after delate the Demo img.”

EX-“GET https://www.insaneboy.in/wp-content/uploads/revslider/black-friday/retail-black-friday-slider-two-bg.jpg 404 (Not Found)”

a screenshot attached bellow.