SetTilte Error after calling SetLayout

I found CXTPDockingPane's SetTitle error after calling paneManager SetLayout.The Error is in CString's GetData().

ASSERT(m_pchData != NULL);

the pchData ==NULL.

How can I do?

My code like the following:

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{

...

 m_pPaneChat = m_paneManager.CreatePane(IDR_PANE_CHAT, CRect(0, 0,150, 120), xtpPaneDockBottom);
 m_pPaneChat->SetTitle(_T("Title1"));
 m_pPaneChat->SetOptions(xtpPaneNoCloseable); 

 CXTPDockingPaneLayout layoutNormal(&m_paneManager);
 if (layoutNormal.Load(_T("NormalLayout")))
    {
  m_paneManager.SetLayout(&layoutNormal);  ; ;
 }

 m_pPaneChat->SetTitle(_T("Title2"));

...

}