MIME type skin error

[sinhapiya123]

Refused to apply style from 'https://localhost:8080/px/admin//skins/content/default/content.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.Understand this error
about:srcdoc:1 Refused to apply style from 'https://localhost:8080/px/admin//skins/ui/oxide/content.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

When I try to load a skin, in console shows this.

How could I resolve?

Thx!

[lorenzo-pomili]

could you provide an example of a configuration that gives you that error?
also I see that in your URL there is double / (https:// localhost:8080/px/admin//skins/ui/oxide/content.css) have you tried to remove it?