Traceback (most recent call last):

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/luigi/scheduler.py", line 943, in _update_task_history
self._task_history.task_started(task_id, host)

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/luigi/db_task_history.py", line 95, in task_started
self._add_task_event(task, TaskEvent(event_name=RUNNING, ts=datetime.datetime.now()))

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/luigi/db_task_history.py", line 108, in _add_task_event
for (task_record, session) in self._find_or_create_task(task):

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/luigi/db_task_history.py", line 122, in _find_or_create_task
task_record.parameters[k] = TaskParameter(name=k, value=v)

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/sqlalchemy/orm/collections.py", line 1225, in __setitem__
value = __set(self, value, _sa_initiator)

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/sqlalchemy/orm/collections.py", line 1044, in __set
item = executor.fire_append_event(item, _sa_initiator)

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/sqlalchemy/orm/collections.py", line 716, in fire_append_event
item, initiator)

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/sqlalchemy/orm/attributes.py", line 936, in fire_append_event
initiator or self._append_token or self._init_append_token())

 "/Users/user/code/app/app-env/lib/python3.4/site-packages/sqlalchemy/orm/unitofwork.py", line 36, in append
sess = state.sessionAttributeError: 'InstanceState' object has no attribute 'parse_session'
Traceback (most recent call last):

 "youtube_dl\extractor\generic.pyo", line 969, in _real_extract

 "youtube_dl\utils.pyo", line 1558, in parse_xml

 "xml\etree\ElementTree.pyo", line 1300, in XML

 "xml\etree\ElementTree.pyo", line 1642, in feed

 "xml\etree\ElementTree.pyo", line 1506, in _raiseerrorParseError: mismatched tag: line 151, column 2