Warning: require_once(config.php): Failed to open stream: No such file or directory in /export/vol2/httpd/htdocs/academic/education/ed/includes/PHPCAS/backup/docs/examples/example_proxy_serviceWeb_chaining.php on line 18

Fatal error: Uncaught Error: Failed opening required 'config.php' (include_path='.:/php/includes:/export/vol2/httpd/htdocs/includes:/export/vol2/httpd/htdocs/its/oit/includes ') in /export/vol2/httpd/htdocs/academic/education/ed/includes/PHPCAS/backup/docs/examples/example_proxy_serviceWeb_chaining.php:18
Stack trace:
#0 {main}
  thrown in /export/vol2/httpd/htdocs/academic/education/ed/includes/PHPCAS/backup/docs/examples/example_proxy_serviceWeb_chaining.php on line 18