Traceback (most recent call last):
  File "manage.py", line 35, in <module>
    import noc.urls
  File "/opt/noc/urls.py", line 18, in <module>
    site.autodiscover()
  File "/opt/noc/lib/app/site.py", line 464, in autodiscover
    {}, {}, "*")
  File "/opt/noc/main/apps/ref/views.py", line 18, in <module>
    from noc.pm.pmprobe.checks.base import check_registry
ImportError: No module named pmprobe.checks.base
upgrade-user: 53: failed to update manifests