Minification failed. Returning unminified contents

Question

I have made my first website using MVC 5 which works fine on my local machine but when I publish it to the server some of the CSS is not minifying correctly.

Answer 1

The issue for me was I had @import in a .css file.

I moved my code into a corresponding .less file that gets compiled on build, which resolved the build error for me. Compiled with Gulp.