WP SMS

i am using wp sms plugin and shreesms.com as my service provider to send sms but whenevr i m trying to update my plugin with my service providers account it says Warning: file_get_contents(https://…@gmail.com&pw=*******): failed to open stream: HTTP request failed! HTTP/1.1 500 Internal Server Error in /home/u279319642/public_html/wp-content/plugins/wp-sms/includes/classes/webservice/shreesms.class.php on line 31