could not parse content for bootstrap.min.css.map code example
Example 1: DevTools failed to load SourceMap: Could not load content for bootstrap.min.css.map
Delete in css/bootstrap.min.css
and delete in css/bootstrap.css
It is working for me.
I hope it will work for you also.
Namaste _/\_
Example 2: adminlte.min.css.map error
Source map files, like bootstrap.min.css.map, are generated automatically during files minification/compiling process. They actually are not needed for the production, but at the same time occupy 3 times more disk space than ones which they are mapping.
If you want just to remove that message, you can either remove comments like in bootstrap.min.css, bootstrap.min.js, popper.min.js or any other ccs file in which you are getting error.