Fatal error: Uncaught Error: Interface "setasign\SetaPDF2\Signer\X509\CollectionInterface" not found in D:\Apache24\htdocs\vendor\setasign\setapdf-signer\library\SetaPDF\Signer\X509\Collection.php:21 Stack trace: #0 {main} thrown in D:\Apache24\htdocs\vendor\setasign\setapdf-signer\library\SetaPDF\Signer\X509\Collection.php on line 21