Python Installation Error: Multiple top-level packages discovered in a flat-layout

I met a problem when I tried to install FinRL-Meta by running "python setup.py install".

> error: Multiple top-level packages discovered in a flat-layout: ['figs', 'agents', 'results', 'datasets', 'finrl_meta', 'trained_models', 'tensorboard_log', 'tutorials_python', 'tutorials_notebook'].
>
> To avoid accidental inclusion of unwanted files or directories,
> setuptools will not proceed with this build.
>
> If you are trying to create a single distribution with multiple packages
> on purpose, you should not rely on automatic discovery.
> Instead, consider the following options:
>
> 1. set up custom discovery (`find` directive with `include` or `exclude`)
> 2. use a `src-layout`
> 3. explicitly set `py_modules` or `packages` with a list of names
>
> To find more information, look for "package discovery" on setuptools docs.

I temporarily solved it by moving the .py files to the root directory of the project.

BTW, FinRL-meta requires "Ta-Lib" and "Tushare" packages. But those two did not mention in the requirements.txt.