Can't shutdown MyGUI correctly.

Hi. in my app I need to restart ogre to change window resolution. so I have to restart and MyGUI too.
there is destructor of my guiManager.


void CGUIManager::DestroyGUI()
{
MyGUI::LayoutManager::getInstance().unloadLayout(m_ListWindowRoot);
//m_GUI->destroyAllChildWidget();
MyGUI::ResourceManager::getInstance().clear();

m_WidgetVector.clear();
if(m_PlayerGUI)
{
delete m_PlayerGUI;
m_PlayerGUI = NULL;
}
if(m_Menus)
{
delete m_Menus;
m_Menus = NULL;
}
if(m_GUI)
{
m_GUI->shutdown();
delete m_GUI;
m_GUI = NULL;
}
}


And there is runtime exception on string "m_GUI->shutdown();" with message:
Unhandled exception at 0x00000000 in spacecode.exe: 0xC0000005: Access violation reading location 0x00000000.

I've tried to solve it a several days...
please help.

First of all, what version of MyGUI do you use? Is there any errors in MyGUI.log?
Also MyGUI::ResourceManager::getInstance().clear();why do you call that? And you also shouldn't care about destroying widgets at MyGUI deinitialisation - on shutdown gui destroy them all.

Also you mentioned that you restart your application. So it's not first MyGUI shutdown, isn't it?

I've used MyGUI 2.2.
On 3.0.1 there is no such error...
problem solved.
thanks =)