Hi @Nawid13 . Firstly, please read this thread for info about how to properly lay out code questions It might also be good to name your threads a bit more descriptively.
Ok, now to your problem. Somewhere in your scene, you’ve got a GameObject that has a component, but doesn’t know what that component is. This usually happens when deleting or improperly renaming scripts. If you have a small amount of components, just go through and find it.
If you have a lot of components and it isn’t practical to go through them all, this wiki page has a decent solution.