I'm not sure about how all this works, but I think that `vm` attribute should be initialized to None in the __init_ method and that all the try/except blocks should be transformed to checks to ensure that `vm` is not `None`.
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I'm not sure about how all this works, but I think that `vm` attribute
should be initialized to None in the __init_ method and that all the
try/except blocks should be transformed to checks to ensure that `vm`
is not `None`.