如何供应现有的slim框架应用程序

I having a problem when accessing the slim framework application.

It is giving me the following error:

 'Warning: require_once(../vendor/autoload.php): failed to open stream:
 No such file or directory in
 /opt/lampp/htdocs/teachkloud/public/index.php on line 11

 Fatal error: require_once(): Failed opening required
 '../vendor/autoload.php' (include_path='.:/opt/lampp/lib/php') in
 /opt/lampp/htdocs/teachkloud/public/index.php on line 11' error.