Fatal error: Uncaught Error: Class 'Sendinblue\Mailin' not found in C:\Landaweb\webs\server\vendor\mailin-api\mailin-api-php\src\Sendinblue\examples\tutorial3.php:8 Stack trace: #0 {main} thrown in C:\Landaweb\webs\server\vendor\mailin-api\mailin-api-php\src\Sendinblue\examples\tutorial3.php on line 8