/*
Error: Undefined variable: "$line-height-base".
        on line 1 of src/scss/components/bootstrap-social.scss

1: $bs-height-base: ($line-height-base + $input-btn-padding-y * 2) !default;
2: $bs-height-lg:   (floor($font-size-lg * $line-height-base) + $input-btn-padding-y-lg * 2) !default;
3: $bs-height-sm:   (floor($font-size-sm * 1.5) + $input-btn-padding-y-lg * 2) !default;
4: $bs-height-xs:   (floor($font-size-sm * 0.2) + $input-btn-padding-y-lg) !default;
5: 
6: .btn-social {

Backtrace:
src/scss/components/bootstrap-social.scss:1
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/script/tree/variable.rb:49:in `_perform'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/script/tree/node.rb:50:in `perform'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/script/tree/operation.rb:67:in `_perform'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/script/tree/node.rb:50:in `perform'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:478:in `visit_variable'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/base.rb:36:in `visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/stack.rb:79:in `block in with_base'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/stack.rb:135:in `with_frame'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/stack.rb:79:in `with_base'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:158:in `visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/base.rb:52:in `map'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/base.rb:52:in `visit_children'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/base.rb:36:in `block in visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/base.rb:36:in `visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:157:in `visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/visitors/perform.rb:10:in `visit'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/root_node.rb:36:in `css_tree'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/tree/root_node.rb:29:in `render_with_sourcemap'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/engine.rb:389:in `_render_with_sourcemap'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/engine.rb:307:in `render_with_sourcemap'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/plugin/compiler.rb:462:in `update_stylesheet'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/plugin/compiler.rb:215:in `block in update_stylesheets'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/plugin/compiler.rb:209:in `each'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/plugin/compiler.rb:209:in `update_stylesheets'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/plugin/compiler.rb:294:in `watch'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/plugin.rb:109:in `method_missing'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/exec/sass_scss.rb:358:in `watch_or_update'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/exec/sass_scss.rb:51:in `process_result'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/exec/base.rb:50:in `parse'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/lib/sass/exec/base.rb:18:in `parse!'
/Library/Ruby/Gems/2.6.0/gems/sass-3.7.4/bin/sass:13:in `<top (required)>'
/usr/local/bin/sass:23:in `load'
/usr/local/bin/sass:23:in `<main>'
*/
body:before {
  white-space: pre;
  font-family: monospace;
  content: "Error: Undefined variable: \"$line-height-base\".\A         on line 1 of src/scss/components/bootstrap-social.scss\A \A 1: $bs-height-base: ($line-height-base + $input-btn-padding-y * 2) !default;\A 2: $bs-height-lg:   (floor($font-size-lg * $line-height-base) + $input-btn-padding-y-lg * 2) !default;\A 3: $bs-height-sm:   (floor($font-size-sm * 1.5) + $input-btn-padding-y-lg * 2) !default;\A 4: $bs-height-xs:   (floor($font-size-sm * 0.2) + $input-btn-padding-y-lg) !default;\A 5: \A 6: .btn-social {"; }