[Bug]: Error when running using gulp

[lilyama]

Describe the bug

Hi, I'm having this kind of error below when trying this plugin

To Reproduce

gulp config

function compileSass() {
  return gulp
    .src(paths.styles.src)
    .pipe($.purgecss({
      content: ["./_src/**/*.html"]
    }))
    .pipe(gulp.dest(paths.styles.dest));
})

error message

gulp-notify: [Error running Gulp] <css input>:4:1: Unknown word

and CSS can't be compiled.

Expected Behavior

I wanna it to work.

Environment

• Node: 14.16.0
• npm: 6.14.11
• gulp: 4.0.2
• gulp-purgecss: 5.0.0

Add any other context about the problem here

No response

Code of Conduct

• I agree to follow this project's Code of Conduct