Warning: require(soap-wsse.php): failed to open stream: No such file or directory in /var/www/html/serversoap/lib/wse/examples/username-sign.php on line 2

Fatal error: require(): Failed opening required 'soap-wsse.php' (include_path='.:/usr/share/php') in /var/www/html/serversoap/lib/wse/examples/username-sign.php on line 2