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

This error occurs when you are trying to use the `DeclarativeMeta` class from the `sqlalchemy.orm` module, but it is not defined in that module.

To fix this error, you can try importing the `declarative_base` function from the `sqlalchemy.ext.declarative` module instead. Here's an example:

from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()

Then you can define your ORM classes using `Base` as the base class:

from sqlalchemy import Column, Integer, String

class MyTable(Base):
    __tablename__ = 'my_table'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    ...

This should resolve the `AttributeError` and allow you to use the `declarative_base` function to define your ORM classes.