Warning: include(header.php): failed to open stream: No such file or directory in /opt/lampp/htdocs/myviews/rtest.php on line 23

Warning: include(): Failed opening 'header.php' for inclusion (include_path='.:/opt/lampp/lib/php') in /opt/lampp/htdocs/myviews/rtest.php on line 23

Fatal error: Call to a member function selectOne() on null in /opt/lampp/htdocs/myviews/rtest.php on line 77