jaguar CLI error when running without arguments

[farzaneka]

 jaguar
usage: jaguar [-h] [-p PREFIX] [-c FILE]
              {db,serve,migrate,worker,dev,autocompletion,entity-relationship-diagram,jwt,email,websocket,router,member,target,token}
              ...

jaguar command line interface.

optional arguments:
  -h, --help            show this help message and exit
  -p PREFIX, --process-name PREFIX
                        A string indicates the logger prefix for this process,
                        it helps to configure separate log files per process.
  -c FILE, --config-file FILE
                        Configuration file, Default: none

sub commands:
  {db,serve,migrate,worker,dev,autocompletion,entity-relationship-diagram,jwt,email,websocket,router,member,target,token}
    db                  Database administrationn
    serve               Serves the application on http.
    migrate             Executes the alembic command
    worker              Task queue administration
    dev                 Development commands
    autocompletion      Bash autocompletion management
    entity-relationship-diagram
                        Generate erd from database. Make sure database and
                        tables exists.
    jwt                 JWT management
    email               Manage emails
    websocket           Websocket related.
    router              Message router.
    member              Manage members
    target              Manage targets
    token               Token related.
Traceback (most recent call last):
  File "/home/farzaneh/.virtualenvs/jaguar/bin/jaguar", line 11, in <module>
    load_entry_point('jaguar', 'console_scripts', 'jaguar')()
  File "/home/farzaneh/.virtualenvs/jaguar/lib/python3.6/site-packages/restfulpy/cli/launchers.py", line 20, in __call__
    return self.launch()
  File "/home/farzaneh/.virtualenvs/jaguar/lib/python3.6/site-packages/restfulpy/application/cli/main.py", line 71, in launch
    sys.exit(exitcode or 0)
UnboundLocalError: local variable 'exitcode' referenced before assignment