SAWarning: At least one scoped session is already present.

[nomed]

Hi ,

when i activate my pluggable app i get the following:

model/init.py:43: SAWarning: At least one scoped session is already present. configure() can not affect sessions that have already been created.
DBSession.configure(bind=engine)
Creating tables
Initializing Migrations
alembic
16:18:40,106 INFO [alembic.migration] Context impl MySQLImpl.
16:18:40,107 INFO [alembic.migration] Will assume non-transactional DDL.
16:18:40,202 ERROR [cliff.app] Could not locate a bind configured on mapper Mapper|Group|tg_group or this Session

any idea on how to fix it ?