illegal use of abstract class

[vituperio]

Hi to all,
i try to write a simple application to do an HTTP post.
i declared this class:

// on the header file
class CProConnect : public CBase, public MHTTPTransactionCallback, public MHTTPDataSupplier,
            public MHTTPAuthenticationCallback
            	{
            	
public:
	
	static CProConnect* NewL();
	static CProConnect* NewLC();
	CProConnect();
	~CProConnect();
	void ConstructL();
}

//on the .ccp file

CProConnect::CProConnect()
  {
  }



CProConnect* CProConnect::NewL()
  {
  CProConnect* self = CProConnect::NewLC();
    CleanupStack::Pop(self);
    return self;
  }


CProConnect* CProConnect::NewLC()
  {
  CProConnect* self = new (ELeave) CProConnect();  //in this line I have the error
    CleanupStack::PushL(self);
    self->ConstructL();
    return self;
  }


void CProConnect::ConstructL()
  {
  //iRepository = CRepository::NewL( KCRUidProfileEngine );
  }



CProConnect::~CProConnect()
	{
	
	}

When I compile i have this error on NewLC funcition:
illegal use of abstract class ('MHTTPAuthenticationCallback::GetCredentialsL(const TUriC8 &, RString, RStringF, RString &, RString &)')

I don't know why i have this error.
Someone can help me?
thank you very much.

[symbianyucca]

check that you have implemented all virtual functions from the MHTTPAuthenticationCallback in the class that derives from it.

[vituperio]

Thank you symbianyucca,
you are right, i forgot to implement all virtual function.
Sorry for my error, i'm a new developer
Thank you very much
vituperio