Failed to create bitmap image

[Handrix]

Hello, i'm using python 2.5 on vista, when i compile my script i got this
error.
wx._core.PyAssertionError: C++ assertion "image.Ok()" failed at
..\..\src\msw\bitmap.cpp(799) in wxBitmap::CreateFromImage(): invalid image

Any idea about this error message ?
Thanks,
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