Why does a compilation error occur when changing colors?

Question

Sass

gulp watch
[16:32:59] Using gulpfile ~/public_html/sitename.loc/gulpfile.js
[16:32:59] Starting 'sass'...
[16:32:59] Starting 'scripts'...
events.js:141
      throw er; // Unhandled 'error' event
      ^
Error: templates/sitename/asset/sass/template/slider.scss
Error: Invalid CSS after "...ground: #f0ede7": expected "}", was ""
        on line 3 of templates/sitename/asset/sass/template/slider.scss
>>     background: #f0ede7
   ----------------^
    at options.error (/home/sergey/public_html/sitename.loc/node_modules/node-sass/lib/index.js:292:26)

I give two options for the development of the problem)
The contents of the slider.scss file (option one, working):

.slider {
    background: #ffffff;
}

And the second option, which breaks just the whole gulp.

.slider {
    background: #f0ede7;
}

That is, I change the color to a different one, not necessarily to #f0ede7, as a matter of fact, only simple colors work.
Where to look for a problem?
PS: There are definitely no misprints in the color.