|Message: Re: Ambiguous hit collection||Not Logged In (login)|
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I'm pretty new to Geant4, but I figured that the string "is ambiguous" would be easy to find in the codebase. As far as I can tell, it shows up in G4SDManager::GetCollectionID(G4String).
The test performed in that code is comparing a return value from a G4HCTable member of the G4SDManager. It seems that the -2 returned by G4HCtable::GetCollectionID(G4String) happens when the name supplied as the G4String is in the list of names two (or more) times. http://www.apc.univ-paris7.fr/~franco/g4doxy/html/classG4HCtable.html#135a0ac56d7a91fed556962b1267c744
Hope that helps ...