Warning: require_once(PEAR.php): Failed to open stream: No such file or directory in /home/paygreen/php/Mail.php on line 46

Fatal error: Uncaught Error: Failed opening required 'PEAR.php' (include_path='/usr/lib/php:/usr/local/lib/php:/home/paygreen/php') in /home/paygreen/php/Mail.php:46 Stack trace: #0 /home/paygreen/public_html/includes/Application.php(3): include() #1 /home/paygreen/public_html/common.php(32): include_once('/home/paygreen/...') #2 /home/paygreen/public_html/index.php(3): include_once('/home/paygreen/...') #3 {main} thrown in /home/paygreen/php/Mail.php on line 46