I have upgraded to the latest release and got the following error from WordPress:
Warning: require_once(/home/w4vaor5/public_html/wp-content/plugins/pta-volunteer-sign-up-sheets/classes/class-pta-sus-ajax.php): failed to open stream: No such file or directory in /home/w4vaor5/public_html/wp-content/plugins/pta-volunteer-sign-up-sheets/pta-volunteer-sign-up-sheets.php on line 696
Fatal error: require_once(): Failed opening required ‘/home/w4vaor5/public_html/wp-content/plugins/pta-volunteer-sign-up-sheets/classes/class-pta-sus-ajax.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/w4vaor5/public_html/wp-content/plugins/pta-volunteer-sign-up-sheets/pta-volunteer-sign-up-sheets.php on line 696