i cannot pass through game object data type on Photon rpc function why?

it seems just fine when passing through int,string and bool data type but not game object ,when passing through game object it will give me an error

Exception: Write failed. Custom type not found: UnityEngine.GameObject
ExitGames.Client.Photon.Protocol18.WriteCustomType (ExitGames.Client.Photon.StreamBuffer stream, System.Object value, System.Boolean writeType) (at C:/Dev/photon-sdk-dotnet/PhotonDotNet/Protocol18Write.cs:685)

you can see my script inside the attatchment that i gave you

Due to size limitations and staying optimized, Photon RPCs don’t allow you to pass something like an entire GameObject.

Here’s the documentation on the supported types.

Instead, you can get the player by their ID and then reference their GameObject, or something to that effect.