Error Baseline monitoring on SCOM 2012 SP1

Hi,

I've been trying to set up some baselining monitors in SCOM 2012 sp1. Yet I get the following error in the event log:

Duplicate Signature ID usage detected for STT Signature ID:. The STT Rule and monitor for this ID  might differ in configuration - please reconcile the settings.   
Alternately, this Signature ID may already be in use. Assign a previously unused Signature ID for this STT Rule/Monitor. 
Module will be unloaded. 

I've checked that the outer sensitivity is greater than the inner sensitivity on the monitor. And the inner sensitivity on the monitor is the same as the sensitivity on the Signature Collection rule.  

Did anyone get baseline monitoring working on SCOM 2012 sp1? Thanks!