Warning: require(./vendor/autoload.php): failed to open stream: No such file or directory in C:\Web\htdocs\recta\customers\mac\backend\class\LandaDocMP.php on line 3

Fatal error: require(): Failed opening required './vendor/autoload.php' (include_path='C:\xampp\php\PEAR') in C:\Web\htdocs\recta\customers\mac\backend\class\LandaDocMP.php on line 3