My site received incomplete email notifications for online orders via PayPal Express. Let me paste the apache log for your reference.
Thank you, appreciate your work.
[Wed Aug 08 16:49:11 2012] [error] [client x.x.x.x] PHP Warning: require_once(/path/to/wp-content/plugins/cart66-lite/pro/models/Cart66MembershipReminders.php): failed to open stream: No such file or directory in /path/to/wp-content/plugins/cart66-lite/cart66.php on line 112, referer: https://www.example.com/wp-admin/plugins.php?plugin_status=active
[Wed Aug 08 16:49:11 2012] [error] [client x.x.x.x] PHP Fatal error: require_once(): Failed opening required '/path/to/wp-content/plugins/cart66-lite/pro/models/Cart66MembershipReminders.php' (include_path='.:/usr/share/php:/usr/share/pear') in /path/to/wp-content/plugins/cart66-lite/cart66.php on line 112, referer: https://www.example.com/wp-admin/plugins.php?plugin_status=active
[Wed Aug 08 16:49:16 2012] [error] [client x.x.x.x] PHP Warning: require_once(/path/to/wp-content/plugins/cart66-lite/pro/models/Cart66MembershipReminders.php): failed to open stream: No such file or directory in /path/to/wp-content/plugins/cart66-lite/cart66.php on line 112
[Wed Aug 08 16:49:16 2012] [error] [client x.x.x.x] PHP Fatal error: require_once(): Failed opening required '/path/to/wp-content/plugins/cart66-lite/pro/models/Cart66MembershipReminders.php' (include_path='.:/usr/share/php:/usr/share/pear') in /path/to/wp-content/plugins/cart66-lite/cart66.php on line 112
[Wed Aug 08 18:11:57 2012] [error] [client x.x.x.x] PHP Fatal error: Call to undefined method Cart66Cart::getTaxRate() in /path/to/wp-content/plugins/cart66-lite/views/cart.php on line 345, referer: https://www.example.com/store/cart/
[Fri Aug 10 10:41:01 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/admin.php?page=cart66_admin&task=view&id=410
[Fri Aug 10 17:07:29 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/admin.php?page=cart66_admin&task=view&id=406
[Fri Aug 10 17:08:06 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/admin.php?page=cart66_admin&task=view&id=407
[Fri Aug 10 17:08:32 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/admin.php?page=cart66_admin&task=view&id=408
[Fri Aug 10 17:08:53 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/admin.php?page=cart66_admin&task=view&id=410
[Tue Aug 14 09:33:07 2012] [error] [client x.x.x.x] PHP Warning: include(/path/to/wp-content/plugins/cart66-lite/pro/views/emails/default-email-receipt.php): failed to open stream: No such file or directory in /path/to/wp-content/plugins/cart66-lite/models/Cart66Common.php on line 171, referer: https://www.example.com/store/express/?token=EC-8YL24083YD251041J&PayerID=DF83P68PH694G
[Tue Aug 14 09:33:07 2012] [error] [client x.x.x.x] PHP Warning: include(): Failed opening '/path/to/wp-content/plugins/cart66-lite/pro/views/emails/default-email-receipt.php' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') in /path/to/wp-content/plugins/cart66-lite/models/Cart66Common.php on line 171, referer: https://www.example.com/store/express/?token=EC-8YL24083YD251041J&PayerID=DF83P68PH694G
[Tue Aug 14 15:21:34 2012] [error] [client x.x.x.x] PHP Warning: include(/path/to/wp-content/plugins/cart66-lite/pro/views/emails/default-email-receipt.php): failed to open stream: No such file or directory in /path/to/wp-content/plugins/cart66-lite/models/Cart66Common.php on line 171, referer: https://www.example.com/store/express/?token=EC-2YC52511CB724642U&PayerID=VY468SK4FCTEE
[Tue Aug 14 15:21:34 2012] [error] [client x.x.x.x] PHP Warning: include(): Failed opening '/path/to/wp-content/plugins/cart66-lite/pro/views/emails/default-email-receipt.php' for inclusion (include_path='.:/usr/share/php:/usr/share/pear') in /path/to/wp-content/plugins/cart66-lite/models/Cart66Common.php on line 171, referer: https://www.example.com/store/express/?token=EC-2YC52511CB724642U&PayerID=VY468SK4FCTEE
[Tue Aug 14 15:36:42 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/index.php?page=cart66_admin&task=view&id=412
[Tue Aug 14 15:36:48 2012] [error] [client x.x.x.x] PHP Fatal error: Class 'Cart66AdvancedNotifications' not found in /path/to/wp-content/plugins/cart66-lite/models/Cart66Admin.php on line 112, referer: https://www.example.com/wp-admin/admin.php?page=cart66_admin&task=view&id=411