Yes and no.
It is happening in the interface between Python and R
and it means that it is dealing with transferring
a Python object back to R. In this particular case,
it is one of the "less usual" but basic types
and the current RSPython code says
that it is not prepared to deal with that.
Can either of you tell me the Python type of
the object being converted?
(You can put a break point in fromPython() in RPythonConverters.c
at the appropriate line (116 in my version).)
That would help me a great deal as a I can probably easily add
code for that case but want to know what it is and
I am in the middle of some other work right now so don't
have the time to set this up to debug it.