Error: string offset 'family'

It's a server side issue, here some solutions:

  1. Try to reinstall all plugins
  2. Be sure Unyson plugin is installed
  3. Be sure you've saved at least once the Appearance > Theme Settings

If issue persist, please install this plugin : https://wordpress.org/plugins/wp-developer-tools/ then the dev bar and check what is your php version. Often cause is an old version of PHP.

If you have an old PHP, something like < 5.3 you should update it (not only for woffice), if you can't do or you not know how to do it, just email your host and them will sove your problem.