Sometimes, when saving an invoice for an order, the following error might come up: Fatal error: Declaration of Zend_Pdf_FileParserDataSource_File::__construct() must be compatible with Zend_Pdf_FileParserDataSource::__construct() in /var/www/vhosts/website/httpdocs/includes/src/Zend_Pdf_FileParserDataSource_File.php on line 41 To solve that problem, open the lib/Zend/Pdf/FileParserDataSource.php class and change the…