TCPDF error: Image file has no extension and no type was specified: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAGCAYAAAD68A/GAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAXSURBVBhXY/wPBAxEACYoTRAMfoUMDADRGQQIKdoTowAAAABJRU5ErkJggg==