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I'm currently starting with sqlalchemy. In my current project I have to do some part with Flask and some other part from the command line. The part about flask is running fine, interfacing with sqlalchemy and all, but the commandline part is not. The error I'm getting is ArgumentError("Class object expected, got 'Table('documentos', MetaData(bind=Engine(postgresql://user:password@localhost/clasificador)), Column('id', Integer(), table=<documentos>, primary_key=True, nullable=False), Column('nombre', String(length=248), table=<documentos>), schema=None)'.",) I've tried my luck with google and reading declarative sqlalchemy, but I can't find what could be the problem. The code in the module is: from sqlalchemy.orm import sessionmaker from db import engine,Base #some other code session = sessionmaker(bind=engine) doc = modelos.documento.Documento(os.path.basename(nelto)) session.add(doc) #here fails session.remove() db is the module where I have the common code for sqlalchemy. most of it comes from flask documentation, and db_session is used only for flask, I made a different session for the other module. from sqlalchemy import create_engine from sqlalchemy.orm import scoped_session, sessionmaker from sqlalchemy.ext.declarative import declarative_base sqldebug=True engine = create_engine( 'postgresql://user:passwd@localhost/clasificador', convert_unicode=True, echo=sqldebug) db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine)) Base = declarative_base(bind=engine) Base.query = db_session.query_property() Finally, here is the "documento" module, although I doubt the problem is here. from sqlalchemy import Column, Integer, String from db import Base class Documento(Base): '''Clase definiendo los docu

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