DevTools failed to load SourceMap: Could not load content for http://127.0.0.1:8000/css/bootstrap.min.css.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILUREenter image description here
1 Answers
This isn't caused by your code,
From your Chrome browser, Go to DevTool Settings by pressing f12 key, then clicking the gear icon 
in the upper right corner.
Disable the checkbox:
- Enable JavaScript source maps
- Enable CSS source maps
Then reload your browser.
For other browser, find Source setting after press f12
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