404 error when using custom class with background image

I tried to set a text on an image by setting a div container with a background image and put a text on it. on my laptop it work perfect and I achieved what I wanted.

But when I upload the website to my server online and open the page, the image that is a background of the class is not showing and if I look the the web inspector I have the error that it can’t load it with 404 error.

I don’t have any problem if it is an image inserted on a bloat, the problem is only if image background of a class.

Could you please help ?