need some help with null pointer exception in Xamarin

[denismu321]

Hi there ,
I just have a question concerning some program I want to write.
I cannot get it to work it always says :
"System.NullReferenceException: Object reference not set to an instance of an object."

Here is some code samples :

using System;
using System.Collections.Generic;
using Steam4NET;
using steamLogin;
using System.Text;
using System.Runtime.Serialization;

namespace steamLogin
{

class functions
{

static void Main()
{
TSteamError err = new TSteamError();
int logged=0;
ISteam003 steam = new ISteam003();
steam.IsLoggedIn(ref logged,ref err);
}
}
}

I cannot call any function without getting a null pointer exception.
Is this because some startup functions have not been called ,or are the functions essentially empty ones ?
Well I do not really understand what is wrong, so I looked for help here.

Thank you in advance.

 

[jmcilhinney]

Have you looked at the stack trace for the exception? What line of your code is it thrown on? Is it thrown by your code or a method called by your code? What reference is null?

 

[denismu321]

thanks for answering so soon.
Here I get the Error message the program is throwing :

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.
at Steam4NET.ISteam003.ChangePassword(String cszCurrentPassphrase, String cszNewPassphrase, TSteamError& pError)
at steamLogin.functions.Main() in C:\Users\muhic\OneDrive\Dokumente\Projects\steamLogin\steamLogin\testing.cs:line 36

and I cannot figure out, what value causes the null exception.
Thanks for any help in advance.

I have included the lib files in the project as well as the dll.

 

[denismu321]

Sorry the error message I provided is not exactly the same for the program sample I showed, but it is basically the same as with all other functions I tried in Steam4NET.

 

[denismu321]

Hi ,thanks for the help ,but I think my problem is one of Steam4NET instead of a c# problem in general.
But anyway thank you for your time.