Hi, i am have a big Problem with CoreSession 0.9 (Zope 2.3.3 Win2000 Server). I have 2 Session Data Mangers (dieter and session_mgr). I i want call the getSessionData() of them both method in 1 Transaction. Via calling foo3 I get the error msgs below. I need to call both Data Mangers in 1 Transaction ! By the way: Zope 2.4.2 hangs for the rest of his live after the 2. calling of foo3 Please Help michael Code: def a(self): """khjkjh""" data = self.dieter.getSessionData() data.set('dfd', 'dsd') return None def b(self): """hjhjh""" data2 = self.session_mgr.getSessionData() return None def foo3(self, REQUEST): """hhjh""" #return "dgffdg" c = self.a() #get_transaction().commit(1) d= self.b() #data = self.session_mgr.getSessionData() return "huhuh" First Call Error Type: error Error Value: release unlocked lock Traceback (innermost last): File E:\Beehive\TeDeLine\lib\python\ZPublisher\Publish.py, line 223, in publish_module File E:\Beehive\TeDeLine\lib\python\ZPublisher\Publish.py, line 187, in publish File E:\Beehive\TeDeLine\lib\python\Zope\__init__.py, line 221, in zpublisher_exception_hook (Object: Traversable) File E:\Beehive\TeDeLine\lib\python\ZPublisher\Publish.py, line 175, in publish File E:\Beehive\TeDeLine\lib\python\Zope\__init__.py, line 235, in commit File E:\Beehive\TeDeLine\lib\python\ZODB\Transaction.py, line 335, in commit File E:\Beehive\TeDeLine\lib\python\ZODB\Connection.py, line 657, in tpc_finish File E:\Beehive\TeDeLine\lib\python\ZODB\BaseStorage.py, line 219, in tpc_finish (Object: SessionStorage) error: (see above) Second Call: Error Type: TransactionErrorError Value: A serious error, which was probably a system error, occurred in a previous database transaction. This application may be in an invalid state and must be restarted before database updates can be allowed. Beware though that if the error was due to a serious system problem, such as a disk full condition, then the application may not come up until you deal with the system problem. See your application log for information on the error that lead to this problem.