Error in executing GetSpecificAuto for LastRecord.

Question

I m facing same problem and even i m using literal also, see my code:

Error in executing GetSpecificAuto for LastRecord. Array ( [0] => Array ( [0] => IMSSP [SQLSTATE] => IMSSP [1] => -14 [code] => -14 [2] => An invalid parameter was passed to sqlsrv_query. [message] => An invalid parameter was passed to sqlsrv_query.

function GetAuto(){$params = array(array("InquiryForm"),   
                            array("Last"),
                            array(0),
                            array(""),
                            array($LastAuto,SQLSRV_PARAM_OUT,SQLSRV_SQLTYPE_DECIMAL(20, 0)));
$processauto = "{CALL GetSpecificAuto(?,?,?,?,?)}";             
$getauto = sqlsrv_query($conn,$processauto,$params);

if($getauto === false)
{
    echo "Error in executing GetSpecificAuto for LastRecord. \n";
   die( print_r( sqlsrv_errors(), true));

}

sqlsrv_free_stmt( $getauto);

return $LastAuto;
}
$auto = GetAuto();
echo $auto;

its not working. My Connection is also working fine. I have checked it with sqlsrv_server_info(), i m also trying this same with the return type array, i need to create a function which returns a array, but that function is also not working.

any help pls.....