LESS in Visual Studio 2015

I have downloaded and imported the font-awesome in my MVC project. I am using the .less files for styling. I have a different less file for styles which runs fine but for some reason the font-awesome less file is not working, it gives the following error: variable @fa-font-size-base is undefined on line 6 in file 'core.less': [5]: display: inline-block; [6]: font: normal normal normal @fa-font-size-base/@fa-line-height-base FontAwesome; // shortening font declaration -----------------------------^ [7]: font-size: inherit; // can't have font-size inherit on line above, so need to override I am not importing any file in the other less files, but seems like font-awesome has a bunch of imports. Can anyone help?