Deprecated: Symfony\Component\Mime\Header\ParameterizedHeader::toTokens(): Implicitly marking parameter $string as nullable is deprecated, the explicit nullable type must be used instead in C:\Apache24\htdocs\laravel\example-app\vendor\symfony\mime\Header\ParameterizedHeader.php on line 88

Fatal error: Uncaught Error: Class "Symfony\Component\Mime\Header\UnstructuredHeader" not found in C:\Apache24\htdocs\laravel\example-app\vendor\symfony\mime\Header\ParameterizedHeader.php:19 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\laravel\example-app\vendor\symfony\mime\Header\ParameterizedHeader.php on line 19