Hello all, I can´t delete records of a table

I'm using this code:

 PersistenceManager pm =
PersistenceManagerHelper.getPersistenceManager();

Transaction tx = pm.currentTransaction();
tx.begin();
Extent ex = pm.getExtent(Robot.class, true);
Iterator iter = ex.iterator();
while (iter.hasNext())
{
Robot obj = (Robot)iter.next();
pm.deletePersistent(obj);
tx.commit();
}

And always delete only two records after I get this message in the
log:

Transaction is not active. You either need to define a transaction
around this, or run your PersistenceManagerFactory with
'NontransactionalRead' and 'NontransactionalWrite' set to 'true'


Anyone can help me, please?

Thanks.

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