Calling hook OnPlayerRespawn resulted in a conflict between the following plugins: SpawnCore - BasePlayer+SpawnPoint (SpawnPoint), RandomRespawner (BasePlayer+SpawnPoint (SpawnPoint))

I think there is a problem with the Plugin ??!!??

It means both this and whatever SpawnCore is are trying to do the same thing.

ok. is this a strong error or only a notify?

It means one of the plugins won't work, whatever one was called first would.