wxWidget class error problem

Hello I get many errors from wxWidget classes and I don't know why. They don't make the program crash. Does somebody know, why wxWidget creates so many errors? Im using the newest stable version of wxWidget and I build the solution at my own. ..\..\src\msw\control.cpp(149): 'CreateWindowEx("ToolbarWindow32", flags=52008900, ex=00000000)' failed with error 0x0000057e (Subordinate window can not be created at the top level.). H:\WxWidgets\include\wx/msw/private.h(406): 'GetClientRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). ..\..\src\msw\window.cpp(1962): 'MoveWindow' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(406): 'GetClientRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). ..\..\src\msw\window.cpp(1962): 'MoveWindow' failed with error 0x00000578 (Invalid window handle). ..\..\src\msw\toolbar.cpp(1112): 'TB_ADDBUTTONS' failed with error 0x00000578 (Invalid window handle). ..\..\src\msw\toolbar.cpp(290): 'TB_GETITEMRECT' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). H:\WxWidgets\include\wx/msw/private.h(394): 'GetWindowRect' failed with error 0x00000578 (Invalid window handle). ..\..\src\msw\window.cpp(1962): 'MoveWindow' failed with error 0x00000578 (Invalid window handle)