sass not compilling after uninstalling node-sass gulp-sass

Hi after fixing my gulp sass node-sass from a project, I got back into my ionic v1 project et now my sass is not compiling anymore. Does someone know what happened here is the error .

@mixin _placeholder {
  $placeholders: ":-webkit-input" ":-moz" "-moz" "-ms-input";
  @each $placeholder in $placeholders {
    &: #{$placeholder}-placeholder {
      @content;
   }
  }
}

events.js:160 throw er; // Unhandled 'error' event ^ Error: scss/utils/mixins.scss 26:40 Invalid CSS after "...$placeholders {": expected "}", was "&: #{$placeholder}-" at options.error (/Users/stephane/Desktop/goservice/node_modules/node-sass/lib/index.js:286:26)

Caught exception: TypeError: Cannot read property 'bold' of undefined at ChildProcess. (/usr/local/lib/node_modules/ionic/node_modules/ionic-app-lib/lib/setup.js:152:38) at emitTwo (events.js:106:13) at ChildProcess.emit (events.js:191:7) at Process.ChildProcess._handle.onexit (internal/child_process.js:215:12)

via stephan lemaitre