Traceback (most recent call last):
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/otree/database.py", line 270, in init_orm
    models = get_models_module(app)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/otree/common.py", line 75, in get_models_module
    return import_module(module_name)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/workplace/lilinfen/GitRepo/modified-otree-snippets/PageImport/__init__.py", line 4, in <module>
    from PageImport.Page1 import *
  File "/workplace/lilinfen/GitRepo/modified-otree-snippets/PageImport/Page1.py", line 3, in <module>
    class Page1(NewPlayer):
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/ext/declarative/api.py", line 76, in __init__
    _as_declarative(cls, classname, cls.__dict__)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/ext/declarative/base.py", line 131, in _as_declarative
    _MapperConfig.setup_mapping(cls, classname, dict_)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/ext/declarative/base.py", line 160, in setup_mapping
    cfg_cls(cls_, classname, dict_)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/ext/declarative/base.py", line 194, in __init__
    self._early_mapping()
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/ext/declarative/base.py", line 199, in _early_mapping
    self.map()
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/ext/declarative/base.py", line 695, in map
    self.cls.__mapper__ = mp_ = mapper_cls(
  File "<string>", line 2, in mapper
  File "<string>", line 2, in __init__
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/util/deprecations.py", line 139, in warned
    return fn(*args, **kwargs)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/orm/mapper.py", line 717, in __init__
    self._configure_inheritance()
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/orm/mapper.py", line 1048, in _configure_inheritance
    self.inherit_condition = sql_util.join_condition(
  File "<string>", line 2, in join_condition
  File "<string>", line 2, in _join_condition
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/util/deprecations.py", line 139, in warned
    return fn(*args, **kwargs)
  File "/home/lilinfen/anaconda3/envs/oTree5/lib/python3.10/site-packages/sqlalchemy/sql/selectable.py", line 976, in _join_condition
    raise exc.NoForeignKeysError(
sqlalchemy.exc.NoForeignKeysError: Can't find any foreign key relationships between 'PageImport_newplayer' and 'PageImport_page1'.