This is the human-readable error text that accompanies the numeric remote-invocation error code for this object's state machine. Because removing a QoS definition touches multiple fabric interconnects asynchronously, UCS Manager models the whole deletion as a state machine, and this object is the FSM's own top-level status record. An example value would be something like 'Failed to configure QoS class on fabric interconnect: resource unavailable', which is far more actionable to a network admin than the bare error code alone.