Syntax Error On Build - Unknown Reason

[l-gothberg]

I keep getting Invalid CSS after "grid": expected expression (e.g. 1px, bold), was ";" (Sass::SyntaxError)

Can't determine the cause of the error, since the indicated expression is correct:

.grid-container {
    display: grid;
}

SASS file is included as attachment, full output of backtrace follows:

/Users/leo/Desktop/github/cs493-cloud-dev/styles.sass:2: Invalid CSS after "grid": expected expression (e.g. 1px, bold), was ";" (Sass::SyntaxError)
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/scss/parser.rb:1308:in `expected'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/script/lexer.rb:240:in `expected!'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/script/parser.rb:897:in `assert_done'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/script/parser.rb:69:in `parse'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/script/parser.rb:228:in `parse'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/script.rb:27:in `parse'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:1169:in `parse_script'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:745:in `parse_property'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:707:in `parse_property_or_rule'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:666:in `parse_line'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:539:in `build_tree'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:558:in `block in append_children'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:557:in `each'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:557:in `append_children'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:548:in `block in build_tree'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:541:in `each'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:541:in `build_tree'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:558:in `block in append_children'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:557:in `each'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:557:in `append_children'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:417:in `_to_tree'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:389:in `_render_with_sourcemap'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/engine.rb:307:in `render_with_sourcemap'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/plugin/compiler.rb:462:in `update_stylesheet'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/plugin/compiler.rb:215:in `block in update_stylesheets'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/plugin/compiler.rb:209:in `each'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/plugin/compiler.rb:209:in `update_stylesheets'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/plugin.rb:82:in `update_stylesheets'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/exec/sass_scss.rb:338:in `watch_or_update'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/exec/sass_scss.rb:51:in `process_result'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/exec/base.rb:50:in `parse'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/lib/sass/exec/base.rb:18:in `parse!'
    from /Library/Ruby/Gems/2.3.0/gems/sass-3.7.3/bin/sass:13:in `<top (required)>'
    from /usr/local/bin/sass:22:in `load'
    from /usr/local/bin/sass:22:in `<main>'
[Finished in 0.4s with exit code 65]
[cmd: ['sass', '--update', '/Users/leo/Desktop/github/cs493-cloud-dev/styles.sass:/Users/leo/Desktop/github/cs493-cloud-dev/styles.css', '--stop-on-error', '--style=compressed', '--trace']]
[dir: /Users/leo/Desktop/github/cs493-cloud-dev]
[path: /usr/local/bin:/usr/bin:/usr/bin/ruby:/bin:/usr/sbin:/sbin]

styles.sass.zip