The "trying to execute" log message happens when a message arrives, but the target object is not present for any reason. Check your warnings -- you will get notified if TNet failed to create an object. My guess is you renamed a prefab you instantiated before, so now TNet can't find it for instantiation.
For convenience, when TNet can't create an object, it creates a dummy of it with a TNObject present. This lets you right-click it in inspector and choose to delete it, thus removing it from the server.