PHP + FPDF error

I have the next PHP function to extract a certain page from a PDF file. require_once(DIR_SYSTEM . 'library/fpdf/[login to view URL]'); // Use FPDF library require_once(DIR_SYSTEM . 'library/fpdi/[login to view URL]'); // Use FPDI library function savePage($source_file, $page){ $page_file = str_replace('.pdf', '_' . $page . '.pdf', $source_file); if(!file_exists($page_file)){ $pdf = new setasign\Fpdi\Fpdi(); $pdf->AddPage(); $count = $pdf->setSourceFile($source_file); if($page > $count){ return false; } else { $pdf->useTemplate($pdf->importPage($page), 0, 0, null, null, true); $pdf->Output('F', $page_file); } } return $page_file; } It works fine with this file: [login to view URL] But got error when try to this one: [login to view URL]