issue with videojsXBlock installation

[Br-Hmedna]

Hello,
I have an issue with videojsXBlock installation.
I wanna to work with xBlock, I tried to install the videojsXBlock https://github.com/MarCnu/videojsXBlock and integrat it into my OpenEdx plateform
Will finishing the execution of the commands, I got this issue:

edxapp@precise64:~/edx-platform$ fun cms.dev run --fast
Traceback (most recent call last):
File "/edx/app/edxapp/venvs/edxapp/bin/fun", line 9, in
load_entry_point('fun-cmd==0.1', 'console_scripts', 'fun')()
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/funcmd/cmd.py", line 13, in fun
run_command(settings, service, fun_args, other_args)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/funcmd/cmd.py", line 72, in run_command
arguments = get_manage_command_arguments(settings, service, *other_args)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/funcmd/cmd.py", line 87, in get_manage_command_arguments
setup_environment(settings, service)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/funcmd/cmd.py", line 121, in setup_environment
startup = importlib.import_module(startup_module)
File "/usr/lib/python2.7/importlib/init.py", line 37, in import_module
import(name)
File "/edx/app/edxapp/edx-platform/cms/startup.py", line 8, in
settings.INSTALLED_APPS # pylint: disable=pointless-statement
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/utils/functional.py", line 184, in inner
self._setup()
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/conf/init.py", line 42, in _setup
self._wrapped = Settings(settings_module)
File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/conf/init.py", line 95, in init
raise ImportError("Could not import settings '%s' (Is it on sys.path?): %s" % (self.SETTINGS_MODULE, e))
ImportError: Could not import settings 'fun.envs.cms.dev' (Is it on sys.path?): No module named validation

Anyone have faced the same issue ?
Do you suggest any solution.

Thanks