debug assertion failed, file:dlgdata.cpp,line43

void CTransDlgBar::DoDataExchange(CDataExchange* pDX)
{
//	CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CTransDlgBar)
DDX_Control(pDX, IDC_EDIT_T17, m_edtRequest);
//此控件已经不存在，此句人工删除	DDX_Control(pDX, IDC_EDIT3, m_edtMyZero);
//此控件已经不存在，词句人工删除	DDX_Control(pDX, IDC_EDIT1, m_edtMxZero);
DDX_Control(pDX, IDC_CHECK1, m_Disp2D);
DDX_Control(pDX, IDC_BTN_TRANS, m_btnTrans);
DDX_Control(pDX, IDC_EDIT2, m_EdtInBuf);
DDX_Control(pDX, IDC_COMBO2, m_DeviceName);
//}}AFX_DATA_MAP
for(int i=0;   i<20;   i++)
{
m_edtTxd[i] = (CEdit *)GetDlgItem(IDC_EDIT_T1 + i);
}
}