Warning: require(./fpdf/fpdf.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/browse_pdf_simple_inc.php on line 2

Fatal error: require(): Failed opening required './fpdf/fpdf.php' (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/browse_pdf_simple_inc.php on line 2