How to fix error returned by __soapCall?

$param['websiteConfigID'] = 729872;
$param['numberOfRecords'] = 10;
$param['numberOfRecords'] = 10;
$client = new SoapClient(WSDL);

$result = $client->__soapCall('GetTicketsStringInputs', array('parameters' => $param));

Fatal error: Uncaught SoapFault exception: 
[Client] Function ("GetTicketsStringInputs") is not a valid method for this service in /home/fmticket/public_html/inc/genericLib.php:279 
Stack trace: 
#0 /home/fmticket/public_html/inc/genericLib.php(279): SoapClient->__soapCall('GetTicketsStrin...', Array) 
#1 /home/fmticket/public_html/resultsTicket.php(12): getTickets(Array) 
#2 {main} thrown in /home/fmticket/public_html/inc/genericLib.php on line 279

how to resolve it?? plz help.

Your code is calling the remote GetTicketsStringInputs function :

$client->__soapCall('GetTicketsStringInputs', ...

The Fatal error you get indicates :

Function ("GetTicketsStringInputs") is not a valid method for this service

It seems pretty clear : the method you're trying to call doesn't exist, it is not provided by the remote web-service.

So, to fix that Fatal Error, you have to stop calling that function ;-)

You should check the WSDL of your webservice : does it really export such a method ?