Steps to reproduce the issue

Made modification to _variables.scss
Save file
Receive Error: Invalid CSS after "...mplate-columns:": expected expression (e.g. 1px, bold), was "[full-start] minmax" on line 17 of scss/blocks/_css-grid.scss

Expected result

Compiled css

Actual result

Error

System information (as much as possible)

MAMP Pro on Mac
PHP 7.1.6
Scout-App Sass compiler
Atom

Additional comments

Note - Removing line 17 entirely or removing the [] around full-start, main-start, main-end, full-end eliminates the Error and the SCSS compiles correctly.
However, not a solution as it breaks the grid.
Not familiar enough with grid-template-columns: to troubleshoot this.
Not techy enough to get SCSS set through node and the terminal to see if running the node build --compilecss command would solve this issue. (as noted in a previous thread)