Bootstrap font – request failed status 404

Hi,

In my Mozilla Developer inspector console I get this error:

Source map error: request failed with status 404
Resource URL: https://xxxxmydomainnamexxxxx.com/wp-content/plugins/tabs-responsive/assets/css/bootstrap-front.css?ver=4.9.8
Source Map URL: bootstrap.css.map

Can you tell me how to fix it?

Thanks!