Loading prefabs with script references from assetbundle

Hi guys !

My problem is here: I'd like to load prefabs from my assetbundle in order to instantiate them in my scene. But when I try to load my prefab, it seems that the script reference in still here but it dosn't find the script ITSELF.

Here's what I get when I drag my prefab manually in my scene (look at the pb.png)

And here's what I get when I load my prefab from my assetbundle (look at the pb2.png)

It seems that the reference is still here, but the C# logo is not there anymore. Obviously, when I try to run the game, I get "The referenced script on this Behaviour is missing" error.

Maybe my assetbundle build was built in a wrong way... but I know that assetbundles cannot contain scripts. So I don't know how to do since I want to load prefabs that contains scripts.

Thank you in advance for your help !