Errno::ENOENT: No such file or directory @ rb_sysopen - compile Use --trace for backtrace.

(VAADIN Developer)

Hi Guys, I've been trying to compile my scss file but failed. I have no problem If I perform "mvn clean install", but I dont have to do that for just a simple update with one css property. 

Im getting this error "error custom-theme.scss (Line 32: File to import not found or unreadable: ../valo/valo.scss.)"

/*
Error: File to import not found or unreadable: ../valo/valo.scss.
        on line 32 of custom-theme.scss
        from line 1 of styles.scss

Backtrace:
custom-theme.scss:32
styles.scss:1
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/import_node.rb:67:in `rescue in import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/import_node.rb:45:in `import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/import_node.rb:28:in `imported_file'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/import_node.rb:37:in `css_import?'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:310:in `visit_import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `block in with_base'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:135:in `with_frame'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `with_base'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:325:in `block (2 levels) in visit_import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:325:in `map'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:325:in `block in visit_import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:88:in `block in with_import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:135:in `with_frame'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:88:in `with_import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:322:in `visit_import'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `block in visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `block in with_base'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:135:in `with_frame'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/stack.rb:79:in `with_base'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:158:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:52:in `block in visit_children'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:52:in `map'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:52:in `visit_children'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:167:in `block in visit_children'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:179:in `with_environment'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:166:in `visit_children'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `block in visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:186:in `visit_root'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/base.rb:36:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:157:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/visitors/perform.rb:10:in `visit'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/root_node.rb:36:in `css_tree'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/tree/root_node.rb:29:in `render_with_sourcemap'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/engine.rb:389:in `_render_with_sourcemap'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/engine.rb:307:in `render_with_sourcemap'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:462:in `update_stylesheet'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:215:in `block in update_stylesheets'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:209:in `each'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:209:in `update_stylesheets'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/plugin/compiler.rb:294:in `watch'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/plugin.rb:109:in `method_missing'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/exec/sass_scss.rb:358:in `watch_or_update'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/exec/sass_scss.rb:51:in `process_result'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/exec/base.rb:50:in `parse'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/lib/sass/exec/base.rb:18:in `parse!'
/Library/Ruby/Gems/2.3.0/gems/sass-3.7.2/bin/sass:13:in `<top (required)>'
/usr/local/bin/sass:22:in `load'
/usr/local/bin/sass:22:in `<main>'
*/
body:before {
  white-space: pre;
  font-family: monospace;
  content: "Error: File to import not found or unreadable: ../valo/valo.scss.\A         on line 32 of custom-theme.scss\A         from line 1 of styles.scss"; }

This is just my code for "custom-theme.scss" file.. It's a standard path for import that i've been using in Netbeans.

@import "../valo/valo.scss";

@mixin custom-theme {
@include valo;

}