title: gulp-ruby-sass TypeError when using .pipe(sass({style:'expanded'))
body: <p>OK. I am having trouble with this code. I've used gulp-ruby-sass before, but I have not encountered this kind of error until now. I am using gulp-ruby-sass 1.0.0. I am simply trying to use gulp-ruby-sass to run my sass files in css. However, this is obviously not working. Any suggestions would be appreciated.</p>
  
  <p>Here's the error: </p>
  
  <pre><code> TypeError: string is not a function
      at Gulp.&lt;anonymous&gt; (/Users/xxxxxxxxxxx/xxxx/xxxxxxx/gulpfile.js:22:15)
      at module.exports (/Users/xxxxxxxxxxx/xxxx/xxxxxxxx/node_modules/gulp/node_modules/orchestrator/lib/runTask.js:34:7)
      at Gulp.Orchestrator._runTask (/Users/xxxxxxxxxxx/xxxx/xxxxxxx/node_modules/gulp/node_modules/orchestrator/index.js:273:3)
      at Gulp.Orchestrator._runStep (/Users/xxxxxxxxxxx/xxxx/xxxxxxx/node_modules/gulp/node_modules/orchestrator/index.js:214:10)
      at Gulp.Orchestrator.start (/Users/xxxxxxxxxxx/xxxx/xxxxxxx/node_modules/gulp/node_modules/orchestrator/index.js:134:8)
      at /usr/local/lib/node_modules/gulp/bin/gulp.js:129:20
      at process._tickCallback (node.js:442:13)
      at Function.Module.runMain (module.js:499:11)
      at startup (node.js:119:16)
      at node.js:929:3
  </code></pre>
  
  <p>The Gulp code I am using for my project is the following: </p>
  
  <pre><code>var gulp = require('gulp'),
      sass = ('gulp-ruby-sass'),
      uglify = require('gulp-uglify'),
      livereload = require('gulp-livereload'),
      plumber = require('gulp-plumber'),
      jshint = require('gulp-jshint');
  
  var paths = {
      sass: 'stylesheets/scss/',
      css: 'stylesheets/css'
      };
  
  gulp.task('lint', function() {
      return gulp.src('angular/app.js')
          .pipe(jshint())
          .pipe(jshint.reporter());
      });
  
  gulp.task('sass', function() {
      return gulp.src(paths.sass + '*.scss')
          .pipe(plumber())
          .pipe(sass({style: 'expanded'})) // HERE IS WHERE THE ERROR OCCURS
          .pipe(gulp.dest(paths.css + '*.css'))
          .pipe(livereload());
      });
  
  gulp.task('scripts', function() {
      return gulp.src('angular/app.js')
          .pipe(plumber())
          .pipe(uglify())
          .pipe(gulp.dest('angular/minjs'))
          .pipe(livereload());
      });
  
  gulp.task('watch', function() {
      livereload.listen();
      gulp.watch(paths.sass + '*.scss', ['sass']);
      gulp.watch('angular/app.js', ['scripts']);
      });
  
  gulp.task('default', ['lint', 'sass', 'scripts', 'watch']);
  </code></pre>