Unable to Re-activate plugin

Please, I can’t reactivate seriously simple podcast after deactivation.. The error message I receive is
Warning: require_once(includes/class-podmotor-handler.php): failed to open stream: No such file or directory in /home/samologo/public_html/wp-content/plugins/seriously-simple-podcasting/seriously-simple-podcasting.php on line 38

Fatal error: require_once(): Failed opening required ‘includes/class-podmotor-handler.php’ (include_path=’.:/opt/cpanel/ea-php70/root/usr/share/pear’) in /home/samologo/public_html/wp-content/plugins/seriously-simple-podcasting/seriously-simple-podcasting.php on line 38

Lastly, can you please let me know how to roleback to previous version?