Invalid storage class for a class member

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C++

file

VisualC++

struct

I wanna define a structure in a header file so that I can use it in multiple .cpp files. And also I wanna use the same structure variable in different .cpp files. I tried and got this error. Please help me. This is my entire header file, the definition of structure is at the bottom. Thanks! And my error is "invalid storage class for a class member".

#pragma once
#include "mysocket1.h"
#include "mysocket2.h"
#include "FineDfThresholdLB.h"


// CsocketDlg dialog
class CsocketDlg : public CDialogEx
{
// Construction
public:
	CsocketDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	enum { IDD = IDD_SOCKET_DIALOG };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support


// Implementation
protected:
	HICON m_hIcon;

	// Generated message map functions
	virtual BOOL OnInitDialog();
	afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	DECLARE_MESSAGE_MAP()
public:
	CButton m_ctlConnect;
	CString m_strMessage;
	CString m_strName;
	int m_iPort;
	CListBox m_ctlRecvd;
	CListBox m_ctlSent;
	int m_iType;
	afx_msg void OnRType();
	afx_msg void OnServer();

public:
	afx_msg void OnClickedBconnect();
	
	void OnAccept(void);
	void OnConnect(void);
	void OnSend(void);
	void OnReceive(void);
	void OnClose(void);
private:
	
	mysocket2 m_sConnectSocket;
	mysocket2 m_sListenSocket;
public:
	afx_msg void OnClickedBsend();
	afx_msg void OnClickedBclose();
private:
	CFineDfThresholdLB m_dFineDfThresholdLB;
public:
	afx_msg void OnClickedFinedfthresholdlbbutton();
protected:
	struct setthresholdfinedflb{
		unsigned char sof_lb;
		//unsigned char msg_type;
		unsigned short command_code;
		unsigned short sequence_no;
		unsigned int msg_length;
		unsigned char eof_lb;
		unsigned char threshold_value;
	};
extern struct setthresholdfinedflb set_thresholdfinedflb;};