Traceback (most recent call last):


 "./manage.py", line 10, in <module>

execute_from_command_line(sys.argv)


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line

utility.execute()


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/django/core/management/__init__.py", line 347, in execute

django.setup()


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/django/__init__.py", line 24, in setup

apps.populate(settings.INSTALLED_APPS)


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/django/apps/registry.py", line 112, in populate

app_config.import_models()


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/django/apps/config.py", line 198, in import_models

self.models_module = import_module(models_module_name)


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/importlib/__init__.py", line 126, in import_module

return _bootstrap._gcd_import(name[level:], package, level)


 "<frozen importlib._bootstrap>", line 994, in _gcd_import


 "<frozen importlib._bootstrap>", line 971, in _find_and_load


 "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked


 "<frozen importlib._bootstrap>", line 665, in _load_unlocked


 "<frozen importlib._bootstrap_external>", line 678, in exec_module


 "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/cities/models.py", line 58, in <module>

class Place(models.Model):


 "/Users/me/.local/share/virtualenvs/develtech-oQr_FNyw/lib/python3.6/site-packages/cities/models.py", line 62, in Place

objects = models.GeoManager()
AttributeError: module 'django.contrib.gis.db.models' has no attribute 'GeoManager'

Traceback (most recent call last):, 


 "lib\\asyncio\\events.py", line 81, in _run, 


 "ipv8\\taskmanager.py", line 131, in done_cb, 


 "ipv8\\taskmanager.py", line 18, in interval_runner, 


 "src\\tribler-core\\tribler_core\\modules\\torrent_checker\\torrent_checker.py", line 100, in check_random_tracker, 


 "src\\tribler-core\\tribler_core\\modules\\torrent_checker\\torrent_checker.py", line 215, in get_valid_next_tracker_for_auto_check, 


 "src\\tribler-core\\tribler_core\\modules\\torrent_checker\\torrent_checker.py", line 222, in get_next_tracker_for_auto_check, 


 "<string>", line 2, in get_next_tracker_for_auto_check, 


 "lib\\site-packages\\pony\\orm\\core.py", line 528, in new_func, 


 "src\\tribler-core\\tribler_core\\modules\\tracker_manager.py", line 129, in get_next_tracker_for_auto_check, 


 "src\\tribler-core\\tribler_core\\modules\\tracker_manager.py", line 24, in tracker_store, 
AttributeError: \'NoneType\' object has no attribute \'TrackerState\'
