Invalid serialized file header when i tried to load a scene

Today i worked on a project all day long, after that i closed it, restarted my pc and after some time when i tried to open the project again it loaded the project really slow and when i try to load my only scene i get this error: “Invalid serialized file header. File: “Assets/Scene1.unity”.”. I just hope i will not lose all my work

I still have this exact same problem. If anyone finds a fix to this, please tell me.