Where and how is the list of functions to be called (corpus) defined? The mistake is obviously there as one of the values in corpus is not a function it's a None. Also if the functions sometimes return a None value (the error would be different but) you cannot join them like that since None is not a string so you need to do filter out the Nones with something like ''.join(y for y in [x() for x in corpus] if y is not None)
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