The graph shows an issue with the transform but, there isn’t any.
Upon launching in playmode and stopping playmode, the error and the stop sign icon will go away.
If you are editing an FSM asset directly this is shown because when editing FSM asset directly, there is no agent (thus the agent is null at that moment). Can you please confirm whether this is shown when you are indeed editing an FSM asset directly instead of an FSM through FSMOwner component?