Serializer Exception with msgpack Serializer

Hello, I tried to test msgpack serializer with an quickstart wordcount example, but there is an Serializer Exception issue... Actually I'm not sure this is an real issue or just another operation fault. :-P .

java.lang.RuntimeException: org.apache.storm.multilang.NoOutputException: Pipe to subprocess seems to be broken! No output read.
Serializer Exception:
Traceback (most recent call last):
  File "/home/shihhao/.local/share/virtualenvs/streamparse-3JLpgEJK/bin/streamparse_run", line 11, in <module>
    sys.exit(main())
  File "/home/shihhao/.local/share/virtualenvs/streamparse-3JLpgEJK/lib/python3.6/site-packages/streamparse/run.py", line 45, in main
    cls(serializer=args.serializer).run()
  File "/home/shihhao/.local/share/virtualenvs/streamparse-3JLpgEJK/lib/python3.6/site-packages/pystorm/component.py", line 483, in run
    storm_conf, context = self.read_handshake()
  File "/home/shihhao/.local/share/virtualenvs/streamparse-3JLpgEJK/lib/python3.6/site-packages/pystorm/component.py", line 311, in read_handshake
    pid_dir, _conf, _context = msg['pidDir'], msg['conf'], msg['context']
TypeError: 'int' object is not subscriptable

{                                                                                                                                                                                         
    "serializer": "msgpack",                                                                                                                                                              
    "topology_specs": "topologies/",                                                                                                                                                      
    "virtualenv_specs": "virtualenvs/",                                                                                                                                                   
    "envs": {                                                                                                                                                                             
        "local-dev": {                                                                                                                                                                                                                                                                                                                   
            "nimbus": "127.0.0.1",                                                                                                                                                        
            "workers": ["127.0.0.1"],                                                                                                                                                     
            "log": {                                                                                                                                                                      
                "level": "error"                                                                                                                                                          
            },                                                                                                                                                                            
            "use_ssh_for_nimbus": false,                                                                                                                                                  
            "virtualenv_root": "/home/shihhao/.virtualenvs/stream",                                                                                                                       
            "use_virtualenv": true                                                                                                                                                        
        }                                                                                                                                                                                                                                                                                                                                       
    }                                                                                                                                                                                     
}

streamparse==3.11.0 Python 3.6.2

pystorm / streamparse

Serializer Exception with msgpack Serializer #403