DevTools failed to load SourceMap: Could not load content for https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css.map: code example

Example: DevTools failed to load SourceMap: Could not load content for bootstrap.min.css.map

Delete /*# sourceMappingURL=bootstrap.min.css.map */ in css/bootstrap.min.css
and delete /*# sourceMappingURL=bootstrap.css.map */ in css/bootstrap.css

It is working for me.
I hope it will work for you also.
Namaste _/\_