Error when trying to automate detection and transfer about blendarmocap HOT 4 OPEN

class DOCKER_CGT_MP_modal_detection_operator(bpy.types.Operator):
    # register the new operator with a custom id
    ...

    def get_chain(self, stream) -> cgt_nodes.NodeChain:
        ...
       return chain

    def get_stream(self):
        # overwrite the stream if necessary
        return stream

    def execute(self, context):
        # here are some changes
        self.user = context.scene.cgtinker_mediapipe  # noqa

        # init stream and chain
        stream = self.get_stream()
        self.node_chain = self.get_chain(stream)
        if self.node_chain is None:
            self.user.modal_active = False
            return {'FINISHED'}

        # memo skipped frames
        self.memo = []
        while self. overwritten_modal(context) == {'PASS_THROUGH'}:
              pass
        return {'OPERATOR_FINISHED'}

    @staticmethod
    def simple_smoothing(memo, cur):
         ...
        return memo

    def overwritten_modal(self, context):
        """ Run detection as modal operation, finish with 'Q', 'ESC' or 'RIGHT MOUSE'. """
       if self.user.detection_input_type == 'movie':
           # get data
           data, _frame = self.node_chain.nodes[0].update([], self.frame)
           if data is None:
               return self.cancel(context)
           self.simple_smoothing(self.memo, data)
           if self.frame % self.key_step == 0:
               for node in self.node_chain.nodes[1:]:
                   node.update(self.memo, self.frame)
               self.memo.clear()

           self.frame += 1
        return {'PASS_THROUGH'}

    def cancel(self, context):
        """ Upon finishing detection clear the handlers. """
        del self.node_chain
        return {'FINISHED'}