Fatal error: Uncaught Error: Class "IMLib_Types_Collection_Serial" not found in C:\SHC\xampp\htdocs\shc_mobile_backend\packages\imapplib\src\IMAppLib\Mail\Send\RecipientList.php:12 Stack trace: #0 {main} thrown in C:\SHC\xampp\htdocs\shc_mobile_backend\packages\imapplib\src\IMAppLib\Mail\Send\RecipientList.php on line 12