Error while using Multiprocessing.Pool in python -

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i tried options not able find issue below code, works when call sub self.processxmlfile(xml_file) throws below error multiprocessing when print result_list:

cpickle.picklingerror: can't pickle <type 'instancemethod'>: attribute lookup __builtin__.instancemethod failed 
            pool = multiprocessing.pool(processes=4)             result_list = []             xml_file in os.listdir(self.local_folder):                     result_list.append(pool.apply_async(self.processxmlfile, args = (xml_file,)))             pool.close()             pool.join()


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