"failed to spawn server object" error.

Hello there! Recently, I started work on an online multiplayer game. However, whenever I fire a projectile, it does not show up on the client side, and I get this error. Failed to spawn server object, did you forget to add it to the NetworkManager? assetId=f010f2e3cf8a984498cd7c80a98627ac netId=5 I added the projectile to the NetworkManager, but I still get the error. Here is the link to the game. https://drive.google.com/open?id=1FMUlG0ahr8JiJJK_h89D3dOMIQVaamQv