Addressable nullref

Hi,
I'm using addressables to load a prefab and get the following error, ON ANDROID, not on the editor:
nullref exception not set to an instance of an object.
ResourcesManagement.asyncoperation.InitializationObjectsOperation.Execute at 0x0000

my system works for loading a sprite for instance, but not this prefab(containing other prefabs).

Does someone has a clue?
I was wondering about my prefab dependencies, do they need to be manually added in the addressable window too?

Thanks

 

My bad, as usual, I forgot I had to "build" the addressables.