Werkzeug Internal Server Error

traceback.txt

Traceback (most recent call last):
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "D:\Personal Files\Projects\swsd\swsd\middleware.py", line 58, in __call__
    return self.app(environ, start_response)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\werkzeug\contrib\fixers.py", line 144, in __call__
    return self.app(environ, start_response)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "D:\Personal Files\Projects\swsd\swsd\utils\api.py", line 35, in handle_exception
    return Flask.handle_exception(self.app, e)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "D:\Personal Files\Projects\swsd\swsd\utils\api.py", line 44, in handle_user_exception
    return Flask.handle_user_exception(self.app, e)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask\app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask_admin\base.py", line 60, in inner
    return f(self, *args, **kwargs)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask_admin\base.py", line 60, in inner
    return f(self, *args, **kwargs)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask_admin\base.py", line 60, in inner
    return f(self, *args, **kwargs)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask_admin\base.py", line 60, in inner
    return f(self, *args, **kwargs)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask_admin\model\base.py", line 1197, in create_view
    if self.create_model(form):
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\flask_admin\contrib\sqla\view.py", line 796, in create_model
    self.session.commit()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\scoping.py", line 149, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 765, in commit
    self.transaction.commit()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 370, in commit
    self._prepare_impl()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 350, in _prepare_impl
    self.session.flush()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 1879, in flush
    self._flush(objects)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 1997, in _flush
    transaction.rollback(_capture_exception=True)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\util\langhelpers.py", line 57, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 1965, in _flush
    self.dispatch.after_flush(self, flush_context)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\event\attr.py", line 216, in __call__
    fn(*args, **kw)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy_continuum\unit_of_work.py", line 208, in after_flush
    self.create_history_objects(session)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy_continuum\unit_of_work.py", line 149, in create_history_objects
    self.update_version_validity(value['target'], version_obj)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy_continuum\unit_of_work.py", line 180, in update_version_validity
    synchronize_session=False
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\query.py", line 2728, in update
    update_op.exec_()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\persistence.py", line 866, in exec_
    self._do_exec()
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\persistence.py", line 963, in _do_exec
    update_stmt, params=self.query._params)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\orm\session.py", line 978, in execute
    clause, params or {})
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\engine\base.py", line 717, in execute
    return meth(self, multiparams, params)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\sql\elements.py", line 317, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\engine\base.py", line 814, in _execute_clauseelement
    compiled_sql, distilled_params
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\engine\base.py", line 927, in _execute_context
    context)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\engine\base.py", line 1076, in _handle_dbapi_exception
    exc_info
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\util\compat.py", line 185, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\engine\base.py", line 920, in _execute_context
    context)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\sqlalchemy\engine\default.py", line 425, in do_execute
    cursor.execute(statement, parameters)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\MySQLdb\cursors.py", line 205, in execute
    self.errorhandler(self, exc, value)
  File "C:\Users\Ian\Envs\swsd\lib\site-packages\MySQLdb\connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
OperationalError: (OperationalError) (1093, "You can't specify target table 'entity_history' for update in FROM clause") 'UPDATE entity_history SET end_transaction_id=%s WHERE entity_history.transaction_id = (SELECT max(entity_history_1.transaction_id) AS max_1 \nFROM entity_history AS entity_history_1 \nWHERE entity_history_1.transaction_id < %s) AND entity_history.id = %s' (2L, 2L, 2L)