EDX Service not starting

[Rajesh]

Dear All

After an installation of xblock related to scorm, I am getting following error in the cms log while starting the services. 

Installation of xblock was successful. But I started facing problem after I restarted the CMS and LMS service. LMS is also not starting.

Any pointer on what this could be:

File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 791, in resolve

    raise VersionConflict(dist, req).with_context(dependent_req)

VersionConflict: (python-dateutil 2.8.0 (/edx/app/edxapp/venvs/edxapp/lib/python2.7/site-packages), Requirement.parse('python-dateutil==2.1'))

Appreciate any help as this is critical.

thanks

Rajesh