Illegal use of incomplete struct/union/class

/*
* ==============================================================================
*  Name        : LbsPositionListener.h
*  Part of     : LBSReference example application
*  Interface   : 
*  Description : Position listener interface
*  Version     : 1.0
*
*  Copyright (c) 2005-2006 Nokia Corporation.
*  This material, including documentation and any related 
*  computer programs, is protected by copyright controlled by 
*  Nokia Corporation.
* ==============================================================================
*/
 
#ifndef LBSPOSITIONLISTENER_H
#define LBSPOSITIONLISTENER_H
 
#include <lbsSatellite.h>
 
class TPositionInfo;
class TPositionSatelliteInfo;
 
/**
*   Position data listener interface listens position information.
*   It can also be used to transfer error messages and codes.
*/
class MLbsPositionListener
    {
    public:
 
        /**
        * PositionInfoUpdatedL informs the listener about new location information
        * @param aModulename The name of the module which provided this information
        * @param aPosInfo Position information class
        */
        virtual void PositionInfoUpdatedL(TPositionInfoBase& aPosInfo,
            const TDesC& aModulename) = 0;
 
        /**
        * ShowErrorL informs the listener about occurred error during position 
        * request process
        * @param aErrorString The error in string format
        */
        virtual void ShowErrorL(const TDesC& aErrorString) = 0;
        
        /**
        * ShowMessageL informs the listener about occurred event during position 
        * request process
        * @param aMessage The message in string format
        */
        virtual void ShowMessageL(const TDesC& aMessage) = 0;
        
    };
 
#endif //LBSPOSITIONLISTENER_H
 
 
// End of File

/*
========================================================================
 Name        : GPSDemoContainer.h
 Author      : 
 Copyright   : Your copyright notice
 Description : 
========================================================================
*/
#ifndef GPSDEMOCONTAINER_H
#define GPSDEMOCONTAINER_H
 
// [[[ begin generated region: do not modify [Generated Includes]
#include <coecntrl.h>       
// ]]] end generated region [Generated Includes]
 
 
// [[[ begin [Event Handler Includes]
// ]]] end [Event Handler Includes]
 
// [[[ begin generated region: do not modify [Generated Forward Declarations]
class MEikCommandObserver;      
class CAknSingleHeadingStyleListBox;
class CEikTextListBox;
// ]]] end generated region [Generated Forward Declarations]
 
 
 
//#include <lbs.h>
#include "LBSPositionRequestor.h"
 
 
 
/**
 * Container class for GPSDemoContainer
 * 
 * @class   CGPSDemoContainer GPSDemoContainer.h
 */
class CGPSDemoContainer : public CCoeControl, public MLbsPositionListener
    {
public:
    // constructors and destructor
    CGPSDemoContainer();
    static CGPSDemoContainer* NewL( 
        const TRect& aRect, 
        const CCoeControl* aParent, 
        MEikCommandObserver* aCommandObserver );
    static CGPSDemoContainer* NewLC( 
        const TRect& aRect, 
        const CCoeControl* aParent, 
        MEikCommandObserver* aCommandObserver );
    void ConstructL( 
        const TRect& aRect, 
        const CCoeControl* aParent, 
        MEikCommandObserver* aCommandObserver );
    virtual ~CGPSDemoContainer();
 
public:
    // from base class CCoeControl
    TInt CountComponentControls() const;
    CCoeControl* ComponentControl( TInt aIndex ) const;
    TKeyResponse OfferKeyEventL( 
            const TKeyEvent& aKeyEvent, 
            TEventCode aType );
    void HandleResourceChange( TInt aType );
    
protected:
    // from base class CCoeControl
    void SizeChanged();
 
private:
    // from base class CCoeControl
    void Draw( const TRect& aRect ) const;
 
private:
    void InitializeControlsL();
    void LayoutControls();
    CCoeControl* iFocusControl;
    MEikCommandObserver* iCommandObserver;
    // [[[ begin generated region: do not modify [Generated Methods]
public: 
    static void AddListBoxItemL( 
            CEikTextListBox* aListBox,
            const TDesC& aString );
    static RArray< TInt >* GetSelectedListBoxItemsLC( CEikTextListBox* aListBox );
    static void DeleteSelectedListBoxItemsL( CEikTextListBox* aListBox );
    CAknSingleHeadingStyleListBox* ListBox();
    static void CreateListBoxItemL( TDes& aBuffer, 
            const TDesC& aHeadingText,
            const TDesC& aMainText );
    void AddListBoxResourceArrayItemL( TInt aResourceId );
    void SetupListBoxIconsL();
    TBool HandleMarkableListCommandL( TInt aCommand );
    // ]]] end generated region [Generated Methods]
    
    // [[[ begin generated region: do not modify [Generated Type Declarations]
public: 
    // ]]] end generated region [Generated Type Declarations]
    
    // [[[ begin generated region: do not modify [Generated Instance Variables]
private: 
    CAknSingleHeadingStyleListBox* iListBox;
    // ]]] end generated region [Generated Instance Variables]
    
    
    // [[[ begin [Overridden Methods]
protected: 
    // ]]] end [Overridden Methods]
    
    
    // [[[ begin [User Handlers]
protected: 
    // ]]] end [User Handlers]
    
public: 
    enum TControls
        {
        // [[[ begin generated region: do not modify [Generated Contents]
        EListBox,
        
        // ]]] end generated region [Generated Contents]
        
        // add any user-defined entries here...
        
        ELastControl
        };
    enum TListBoxImages
        {
        // [[[ begin generated region: do not modify [Generated Enums]
        EListBoxFirstUserImageIndex
        
        // ]]] end generated region [Generated Enums]
        
        };
 
 
/*private:
    
    RPositionServer iPosServer;
    RPositioner iPositioner;
    TPositionModuleId iModuleId;
    TPositionUpdateOptions iUpdateOptions;
    TPositionInfo iPosInfo;
    TRequestStatus iStatus;
    
    void StartTrackingLC();*/
    //void StopTracking/*L*/();
 
 
 
 
private:
    CLbsPositionRequestor* iPositionRequestor;
    //CDesCArray* iItemArray;
    
public:
    void PositionInfoUpdatedL(TPositionInfoBase& aPosInfo,
        const TDesC& aModulename);   
    void ShowErrorL(const TDesC& aErrorString);
    void ShowMessageL(const TDesC& aMessage);
    
};
 
#endif // GPSDEMOCONTAINER_H

class CGPSDemoContainer : public CCoeControl, public MLbsPositionListener