Render shows just Grey

I´m having a problem of the render(eevee). on the shading tap render view works normally. but as soon as I render, it just shows the Grey render without any object as you can see in the render tab. Does anyone knows what it might be?

I have used previous file that didn´t have render problem and append all the objects, so that I have every setting same as previous file. but still render shows only grey.

I would appreciate if any one knows what cause this.