A problem to run alembic revision

[SweetyAngel]

I run alembic revision with this command:

alembic revision --autogenerate -m "Initial revision"

And get this output:

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Scripts\alembic.exe\__main__.py", line 7, in <module>
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\config.py", line 636, in main
    CommandLine(prog=prog).main(argv=argv)
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\config.py", line 626, in main
    self.run_cmd(cfg, options)
d
    fn(
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\command.py", line 236, in revision
    script_directory.run_env()
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\script\base.py", line 586, in run_env
    util.load_python_file(self.dir, "env.py")
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\util\pyfiles.py", line 95, in load_python_file
    module = load_module_py(module_id, path)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\util\pyfiles.py", line 113, in load_module_py
    spec.loader.exec_module(module)  # type: ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap_external>", line 940, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "C:\Users\mccvo\OneDrive\Рабочий стол\fastapi-banking-app\migrations\env.py", line 14, in <module>
    config.set_section_option(sections, "DB_USER", DB_USER)
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\site-packages\alembic\config.py", line 296, in set_section_option
    self.file_config.set(section, name, value)
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\configparser.py", line 1221, in set
    self._validate_value_types(option=option, value=value)
  File "C:\Users\mccvo\AppData\Local\Programs\Python\Python311\Lib\configparser.py", line 1206, in _validate_value_types
    raise TypeError("option values must be strings")
TypeError: option values must be strings

I do not know where is a problem.
Command

alembic revision -m "Initial revision"

runs with no errors.
Alembic version: 1.13.3
OS: Windows 10

[CaselIT]

Hi,

It's in your stack trace:
config.set_section_option(sections, "DB_USER", DB_USER)

You are probably settling something that's not a string