graphical user interface - FreeNAS Web UI not responding

Our FreeNAS is running; I can login via ssh.

But the Web UI is not responding.

From How to restart web ui on freenas I tried
service nginx restart
which gave:

Performing sanity check on nginx configuration:
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
Stopping nginx.

Waiting for PIDS: 2180.
Performing sanity check on nginx configuration:
nginx: the configuration file /usr/local/etc/nginx/nginx.conf syntax is ok
nginx: configuration file /usr/local/etc/nginx/nginx.conf test is successful
Starting nginx.

then service django restart and got:

cat: /var/run/django.pid: No such file or directory

usage: kill [-s signal_name] pid ...
       kill -l [exit_status]
       kill -signal_name pid ...
       kill -signal_number pid ...
Traceback (most recent call last):
  File "/usr/local/www/freenasUI/manage.py", line 59, in 
    execute_manager(settings)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
  File "/usr/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 379, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/base.py", line 219, in execute
    self.validate()
  File "/usr/local/lib/python2.7/site-packages/django/core/management/base.py", line 249, in validate
    num_errors = get_validation_errors(s, app)
  File "/usr/local/lib/python2.7/site-packages/django/core/management/validation.py", line 35, in get_validation_errors
    for (app_name, error) in get_app_errors().items():
  File "/usr/local/lib/python2.7/site-packages/django/db/models/loading.py", line 146, in get_app_errors

    self._populate()
  File "/usr/local/lib/python2.7/site-packages/django/db/models/loading.py", line 61, in _populate
    self.load_app(app_name, True)
  File "/usr/local/lib/python2.7/site-packages/django/db/models/loading.py", line 78, in load_app
    models = import_module('.models', app_name)
  File "/usr/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
  File "/usr/local/www/freenasUI/freeadmin/models.py", line 29, in 
    from south.modelsinspector import add_introspection_rules
  File "/usr/local/lib/python2.7/site-packages/South-0.7.3-py2.7.egg/south/modelsinspector.py", line 17, in 

    from django.contrib.contenttypes import generic
  File "/usr/local/lib/python2.7/site-packages/django/contrib/contenttypes/generic.py", line 13, in 
    from django.contrib.admin.options import InlineModelAdmin, flatten_fieldsets
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/__init__.py", line 4, in 
    from django.contrib.admin.options import ModelAdmin, HORIZONTAL, VERTICAL
  File "/usr/local/lib/python2.7/site-packages/django/contrib/admin/options.py", line 8, in 
    from django.contrib import messages
  File "/usr/local/lib/python2.7/site-packages/django/contrib/messages/__init__.py", line 1, in 
    from api import *
EOFError: EOF read where object expected

Starting django

GUI is still not working. Should I try reboot ? Or is there another way?