 <p>This is a <a href="https://github.com/bower/bower/issues/2262" rel="nofollow">permissions with Bower</a>, as suggested from the error (not a Cloud9 specific issue).</p> <p>Use the following to fix it:</p> <p><code>sudo chown -R $USER:$GROUP ~/.npm</code></p> <p><code>sudo chown -R $USER:$GROUP ~/.config</code></p>