THE Database is working fine with the php script/nusoap. but if i try to retrieving information about a particular student, visual studio (c#) crashes. I have another code that retrieve only a single row but i want every subject remain about a student. The attach file is the error message from visual studio.
please i need urgent help.

Code:
Here is my nusoap/php script 

function GetRemainingSubject($Sid){
...