mPDF error: IMAGE Error (https://maps.googleapis.com/maps/api/staticmap?center=Boleslavská%201391/,%20250%2001%20Brandýs%20nad%20Labem%20-%20Stará%20Bole&zoom=14&size=400x300&markers=color:black%7CBoleslavská%201391/,%20250%2001%20Brandýs%20nad%20Labem%20-%20Stará%20Bole): Error parsing image file - image type not recognised, and not supported by GD imagecreate