AttributeError: module 'sqlalchemy.orm' has no attribute 'DeclarativeMeta'

The error message "AttributeError: module 'sqlalchemy.orm' has no attribute 'DeclarativeMeta'" usually occurs when there is an issue with the installation or version of the SQLAlchemy library. The error message suggests that the module 'sqlalchemy.orm' does not have the attribute 'DeclarativeMeta', which is a key component of the SQLAlchemy library used for creating ORM (Object Relational Mapping) models.

To fix this error, you can try the following steps:

1. Make sure that you have installed the latest version of SQLAlchemy library. You can use the following command to install the latest version:

   pip install --upgrade sqlalchemy

2. If you have already installed the latest version of SQLAlchemy, try uninstalling and then reinstalling the library. You can use the following commands to uninstall and reinstall the library:

   pip uninstall sqlalchemy
   pip install sqlalchemy

3. If the issue still persists, try importing the 'DeclarativeMeta' attribute directly from the 'sqlalchemy.ext.declarative' module instead of 'sqlalchemy.orm'. You can use the following code to import 'DeclarativeMeta':

   from sqlalchemy.ext.declarative import DeclarativeMeta

This should resolve the issue and allow you to use 'DeclarativeMeta' to create ORM models in SQLAlchemy.