Deprecated: Symfony\Component\Mime\Header\AbstractHeader::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\AbstractHeader.php on line 232

Fatal error: Uncaught Error: Interface "Symfony\Component\Mime\Header\HeaderInterface" not found in C:\Apache24\htdocs\laravel\example-app\vendor\symfony\mime\Header\AbstractHeader.php:21 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\laravel\example-app\vendor\symfony\mime\Header\AbstractHeader.php on line 21