Reporting an error with WP Smush Pro

I could not sign into my site and checked error logs. I am copying this error message:
[26-Dec-2016 17:23:52 America/Denver] PHP Fatal error: Call to undefined method WpSmushitAdmin::filter_by_mime() in /home2/rmsaorg/public_html/rmsatemp/wp-content/plugins/wp-smush-pro/lib/class-wp-smush-stats.php on line 79

I deactivated the plugin and was able to sign in. Please advise as I really like this plugin. I have granted site access. Thank you very much!