Warning: require(SOAP/Client.php): failed to open stream: No such file or directory in /var/www/html/a2billing/webservice/SOAP/test-callback-server.php on line 40

Fatal error: require(): Failed opening required 'SOAP/Client.php' (include_path='.:/usr/share/php') in /var/www/html/a2billing/webservice/SOAP/test-callback-server.php on line 40