It seems that creating a corpus using the "Selected list" item is broken (feedback from a real user).

Error Message : SendResponseError (ResponseBodyError (ForeignError "Unexpected token 'S', "Something went wrong" is not valid JSON") (rf)

There is a way round it (export the list and then create the corpus with no list, and then import back the list) so that's not a big trouble. But should work or removed to my point of view