python - Error serving large files when using Flask and Tornado -

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i serving large static files ~70 mb, able download files when working in flask alone, getting error below when using tornado , flask. 

exception ignored in: <bound method future.__del__ of <tornado.concurrent.future object @ 0x32c61acc>> traceback (most recent call last):     file "/home/user/virtual/lib/python3.4/site-packages/tornado/concurrent.py", line 333, in __del__     file "/usr/local/lib/python3.4/traceback.py", line 181, in format_exception     file "/usr/local/lib/python3.4/traceback.py", line 153, in _format_exception_iter     file "/usr/local/lib/python3.4/traceback.py", line 18, in _format_list_iter     file "/usr/local/lib/python3.4/traceback.py", line 65, in _extract_tb_or_stack_iter     file "/usr/local/lib/python3.4/linecache.py", line 15, in getline     file "/usr/local/lib/python3.4/linecache.py", line 41, in getlines     file "/usr/local/lib/python3.4/linecache.py", line 126, in updatecache     file "/usr/local/lib/python3.4/tokenize.py", line 437, in open attributeerror: 'module' object has no attribute 'open'

here code using serve files

def download(path):      def generate():         open(path, 'rb') file_handler:             while true:                 chunk = file_handler.read(1024)                 if not chunk:                     break                 yield chunk     return response(generate(), direct_passthrough=true, mimetype='application/octet-stream',                     headers={'content-disposition': 'attachment;filename={}'.format(os.path.basename(path))})  http_server = httpserver(wsgicontainer(app)) http_server.listen(port, address='0.0.0.0') ioloop.instance().start()


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