cannot select local player Authority

i´m trying to make a network video game, everything was going well until one occasion opened the unity and when you run it, notice that told me that there was no prefab in the network manager, check my prefab and had no longer the model 3D , I think I just had to do it again, but when I try, to add the network identity, and select “local player authority” I went out the legend that “cannot be set for local player Authority objects”, and not that because of that my characters do not they move on clients.

any idea how to fix this?

thinking that the file is damaged netwoirking.engine try replacing it with another but the error was not corrected. equal and tried to make new scenes, new projects but everything remains the same, the error no fix.