Magento – NameError: variable @font-family-name__base is undefined

Include locally stored fonts

To include a custom font stored locally, use one of the following approaches:

If you build a theme using Magento UI library, declare the font by adding the .lib-font-face mixin in the <theme_dir>/web/css/source/_typography.less file:

.lib-font-face(
    @family-name:'<any_font_name>',
    @font-path: '@{baseDir}fonts/<path_to_font_file>',
    @font-weight: <font_weight>,
    @font-style: <font_style>
)

Where:

{@baseDir} stands for the app/design/frontend/<Vendor>/<theme>/web directory.

<path_to_font_file> includes the font file name, but without the extension. For example, @font-path: '@{baseDir}fonts/Luma-Icons' for the font stored in web/fonts/Luma-Icons.woff

The mixin generates the CSS including font. For example, here is how the generated CSS looks for the Open Sans font used in the Blank theme:

@font-face {
    font-family: 'Open Sans';
    src: url('../fonts/opensans/light/opensans-300.eot');
    src: url('../fonts/opensans/light/opensans-300.eot?#iefix') format('embedded-opentype'), url('../fonts/opensans/light/opensans-300.woff2') format('woff2'), url('../fonts/opensans/light/opensans-300.woff') format('woff'), url('../fonts/opensans/light/opensans-300.ttf') format('truetype'), url('../fonts/opensans/light/opensans-300.svg#Open Sans') format('svg');
    font-weight: 300;
    font-style: normal
}

If your theme does not use the Magento UI library, include the font in your theme .css files by the standard means of CSS, for example the @font-face rule.

Change below code in your _typography.less

@family-name: 'Exo 2';

Change with

@family-name: @font-family-name__base,