Scheduler Service: Error creating scheduled jobs list

Scheduler Service: Error creating scheduled jobs list

Good morning for you all!!

I have an issue due the timers on service center. 
I'm on test server and i made a new timer.. everything is activated and when i try to run, nothing happens.. I was searching something wrong on service center and i found that on Platform monitoring the timer processor and timers fetcher are disabled even if a start all outsystems service! Then when i restarted it, in service center appers the following message:

Module Name:
Scheduler Service: Error creating scheduled jobs list
OutSystems.HubEdition.RuntimePlatform.InvalidCommitOrRollbackException: Cannot rollback this transaction: Possibly already closed by a Thread
at OutSystems.HubEdition.RuntimePlatform.DBConnectionManager.endCommitableTransaction(IDbTransaction trans, Boolean commit)
at OutSystems.HubEdition.RuntimePlatform.DBConnectionManager.RollbackTransaction(IDbTransaction trans)
at OutSystems.HubEdition.RuntimePlatform.DBTransactionManager.RollbackTransaction(IDbTransaction trans)
at #83b.#n4b.#y5b()
eSpaceVer: 0 (Id=0, PubId=0, CompiledWith=
RequestUrl: (Method: )
AppDomain: Scheduler.exe
Path: C:\...\SC\
DateFormat: yyyy-M-d
PID: 5320 ('Scheduler', Started='27-02-2012 15:39:57', Priv=22Mb, Virt=150Mb)
TID: 11
Thread Name: Timers Fetcher
.NET: 2.0.50727.3625

I dont know what to do... Someone can help me pls?!?

Thank you in advance.
Best regards,

Bruno Fonseca