[Pharo-project] [Fuel] Materialization error, #DoIt Not found

Hi, I was working with Fuel to save and load a Roassal view (serialize and materialize), and everything works perfect (so far) except for one thing: if I have an Anouncer which its registry has an announcementSubscription with a nil subscriber, it does not work is gives me this error: Standard Roassal interactions are OK, but if I do: aRoElement on: ROMouseClick do: [something] in a Wokspace materialization does not work. If I execute the same code in a method send as message to an object I have not this error and materialization works perfectly. This means I can not save some visualizations created in the Workspace. Have anyone experience something like this? Thanks, Vanessa.