Fatal error: Uncaught Error: Interface "setasign\SetaPDF2\Core\DataStructure\DataStructureInterface" not found in D:\Apache24\htdocs\vendor\setasign\setapdf-core\library\SetaPDF\Core\DataStructure\Tree\AbstractTree.php:36 Stack trace: #0 {main} thrown in D:\Apache24\htdocs\vendor\setasign\setapdf-core\library\SetaPDF\Core\DataStructure\Tree\AbstractTree.php on line 36