
Traceback (most recent call last):


 "/opt/tljh/user/lib/python3.7/site-packages/tornado/web.py", line 1590, in _execute

result = method(*self.path_args, **self.path_kwargs)


 "/opt/tljh/user/lib/python3.7/site-packages/tornado/web.py", line 3006, in wrapper

return method(self, *args, **kwargs)


 "/opt/tljh/user/lib/python3.7/site-packages/nbgrader/server_extensions/formgrader/base.py", line 108, in wrapper

return f(self, *args, **kwargs)


 "/opt/tljh/user/lib/python3.7/site-packages/nbgrader/server_extensions/formgrader/base.py", line 117, in wrapper

return f(self, *args, **kwargs)


 "/opt/tljh/user/lib/python3.7/site-packages/nbgrader/server_extensions/formgrader/apihandlers.py", line 167, in get

submissions = self.api.get_submissions(assignment_id)


 "/opt/tljh/user/lib/python3.7/site-packages/nbgrader/apps/api.py", line 587, in get_submissions

db_submissions = gb.submission_dicts(assignment_id)


 "/opt/tljh/user/lib/python3.7/site-packages/nbgrader/api.py", line 3079, in submission_dicts

.group_by(SubmittedAssignment.id)


 "/opt/tljh/user/lib/python3.7/site-packages/sqlalchemy/orm/util.py", line 1192, in aliased

adapt_on_names=adapt_on_names,


 "/opt/tljh/user/lib/python3.7/site-packages/sqlalchemy/orm/util.py", line 495, in __init__

mapper = insp.mapper

AttributeError: 'CompoundSelect' object has no attribute 'mapper'

Traceback (most recent call last):

 "/root/.ansible/tmp/ansible-tmp-1412360673.33-152814301059563/service", line 2836, in <module>
main()

 "/root/.ansible/tmp/ansible-tmp-1412360673.33-152814301059563/service", line 1274, in main
service.service_enable()

 "/root/.ansible/tmp/ansible-tmp-1412360673.33-152814301059563/service", line 695, in service_enable
d = self.get_systemd_status_dict()

 "/root/.ansible/tmp/ansible-tmp-1412360673.33-152814301059563/service", line 507, in get_systemd_status_dict
return dict(line.split('=', 1) for line in out.splitlines())ValueError: dictionary update sequence element #56 has length 1; 2 is required