Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Part\AbstractMultipartPart" not found in C:\svn\conexerp\vendor\symfony\mime\Part\Multipart\AlternativePart.php:19 Stack trace: #0 {main} thrown in C:\svn\conexerp\vendor\symfony\mime\Part\Multipart\AlternativePart.php on line 19