Estou com um problema em visualizar os usuários

Hello.
I have a problem with viewing the users I exported from an old installation of my site. This installation had the same domain, I just migrated to work only with the voice plugins.

View the message that is displayed:
Fatal error: Can not use object of type WP_Error as array in /home/webfox33com12br4/public_html/wp-content/plugins/wp-hummingbird/core/modules/class-module-gravatar.php on line 137