Warning: require_once(PEAR/Frontend.php): failed to open stream: No such file or directory in pearcmd.php on line 53

Warning: require_once(PEAR/Frontend.php): failed to open stream: No such file or directory in E:\myweb\webapi\webapi\pear\pearcmd.php on line 53

Fatal error: require_once(): Failed opening required 'PEAR/Frontend.php' (include_path='E:\Program Files\PHP\pear') in E:\myweb\webapi\webapi\pear\pearcmd.php on line 53