However, although it compiles, it still has the same problem reported before:
<pre>
----- Begin Fatal Exception 20-Jan-2014 23:19:37 CET-----------------------
An exception of category 'InvalidReference' occurred while
   [0] Processing run: 1 lumi: 1 event: 1
   [1] Running path 'simulation_step'
   [2] Calling event method for module MixingModule/'mix'
Exception Message:
Inconsistency RefCore::pushBackItem: Ref or Ptr is inconsistent with RefVector (PtrVector)id = (1:183) should be (1:164)
----- End Fatal Exception -------------------------------------------------
</pre>