I'm trying to import an .xlsx file into my app. So far it went well with simple files but now I have a complex (formulas, images, charts etc) file and it throws me "Undefined index:" with error in Excel2007.php at line 1501:
$objDrawing->setPath("zip://".PHPExcel_Shared_File::realpath($pFilename)."#" . $images[(string) self::array_item($blip->attributes("http://schemas.openxmlformats.org/officeDocument/2006/relationships"), "embed")], false);
Any idea what can cause this error?