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 declaration of the abstract function __construct like this:

From

to

Solving the “Fatal error: Declaration of Zend_Pdf_FileParserDataSource_File::__construct()” error
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