Fatal error: Class 'WA_Widget_Avatars' not found in /home/toasts/public_html/wp-includes/w

Each time I install Avatars on my site I get the following message when I network activate it:
Fatal error: Class 'WA_Widget_Avatars' not found in /home/toasts/public_html/wp-includes/widgets.php on line 413

I have to delete the Avatars folder from the Plugins folder via my cpanel to get the site working again.

I installed Avatars via the dashboard.