Error when using PyRoot due to ROOT version(?)

I keep getting this error, regardless of which root version I try:

  File "/cvmfs/", line 163, in _fallback_getattr
    raise AttributeError("Failed to get attribute {} from ROOT".format(name))
AttributeError: Failed to get attribute Double from ROOT

As it seems connected to python @etejedor may help you. It would be helpful if you could provide a small reproducer and also tell us on which platform you are running. It looks like you are using ROOT version 6.22


ROOT.Double is no longer available, to pass a double by reference please use ctypes as described here:

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