Uncaught TypeError: Cannot read property ‘left’ of undefined

If you see this error in browser console, it is generally due to your theme that has modified Row Structure of Visual Composer plugin.

How to resolve this?

  1. Put this in your browser address – yoursite-url/wp-admin/admin.php?page=ultimate-modules&author#ultimate-debug
  2. Turn ON the Theme Support Switch

And the issue will be resolved.

See one minute video tutorial here.