Can't create server

[tech62]

All dependencies are installed except MySQL-python (replaced by mysqlclient - It works)
Python 2.7.16
Debian 10 - Buster
Bug caused from serverstf/python-valve#54 ?

pip install python-valve
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Requirement already satisfied: python-valve in /usr/local/lib/python2.7/dist-packages (0.2.1)
Requirement already satisfied: docopt>=0.6.2 in /usr/local/lib/python2.7/dist-packages (from python-valve) (0.6.2)
Requirement already satisfied: enum34>=1.1 in /usr/lib/python2.7/dist-packages (from python-valve) (1.1.6)
Requirement already satisfied: requests>=2.0 in /usr/local/lib/python2.7/dist-packages (from python-valve) (2.20.0)
Requirement already satisfied: six>=1.6 in /usr/local/lib/python2.7/dist-packages (from python-valve) (1.10.0)
Requirement already satisfied: monotonic in /usr/local/lib/python2.7/dist-packages (from python-valve) (1.1)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in /usr/local/lib/python2.7/dist-packages (from requests>=2.0->python-valve) (3.0.4)
Requirement already satisfied: certifi>=2017.4.17 in /usr/local/lib/python2.7/dist-packages (from requests>=2.0->python-valve) (2019.6.16)
Requirement already satisfied: urllib3<1.25,>=1.21.1 in /usr/local/lib/python2.7/dist-packages (from requests>=2.0->python-valve) (1.24.3)
Requirement already satisfied: idna<2.8,>=2.5 in /usr/local/lib/python2.7/dist-packages (from requests>=2.0->python-valve) (2.7)

but i've got this error

[2019-08-28 18:57:43,239] {/usr/local/lib/python2.7/dist-packages/flask/app.py:1423} ERROR - Exception on /server/create [POST]
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.7/dist-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/var/www/get5-web/get5/server.py", line 59, in server_create
    if mock or util.check_server_connection(server):
  File "/var/www/get5-web/get5/util.py", line 32, in check_server_connection
    server.ip_string, server.port, server.rcon_password, 'status')
  File "/var/www/get5-web/get5/util.py", line 76, in send_rcon_command
    from valve.source.rcon import (RCON, IncompleteMessageError,
ImportError: No module named rcon
[2019-08-28 18:57:43,239] {/var/www/get5-web/get5/__init__.py:155} ERROR - No module named rcon