Gemfile requires Y error

13 Aug 2016

I got error when I updated jekyll to 3.0 like:

You have already activated X, but your Gemfile requires Y

This is very annoying and fixed it for whole afternoon.

the solution

test bundle exec jekyll instead of just jekyll
then change gulpfile

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  const child = require('child_process');
  gulp.task('jekyll', () => {
    const jekyll = child.spawn('bundle', ['exec','jekyll','build',
      '--watch',
      '--incremental',
      '--drafts'
    ]);
  });