Add iso to drive gives rollback error

[mebuntu]

The transaction is inactive due to a rollback in a subtransaction. Issue rollback() to cancel the transaction.

Por favor. Informe a los desarrolladores de este error. Indique brevemente que es lo que estaba haciendo, y copie todo este mensaje.(Wiithon 1.21 (rev 493))

Traceback (most recent call last):
  File "/usr/share/wiithon/gui.py", line 2288, in termina_trabajo_anadir
    self.refrescarParticionesWBFS(False)
  File "/usr/share/wiithon/gui.py", line 449, in refrescarParticionesWBFS
    self.lParti = self.core.sincronizarParticiones()
  File "/usr/share/wiithon/core.py", line 74, in sincronizarParticiones
    particion = self.getParticion(device)
  File "/usr/share/wiithon/core.py", line 125, in getParticion
    particion = session.query(Particion).filter(sql).first()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1535, in first
    ret = list(self[0:1])
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1444, in __getitem__
    return list(res)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1604, in __iter__
    return self._execute_and_instances(context)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 1609, in _execute_and_instances
    mapper=self._mapper_zero_or_none())
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 700, in execute
    return self._connection_for_bind(engine, close_with_result=True).execute(
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 641, in _connection_for_bind
    return self.transaction._connection_for_bind(engine)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 301, in _connection_for_bind
    self._assert_is_active()
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/session.py", line 233, in _assert_is_active
    "The transaction is inactive due to a rollback in a "
InvalidRequestError: The transaction is inactive due to a rollback in a subtransaction. Issue rollback() to cancel the transaction.