What does Undetermined meter mean?

I am a little confused when I saw the error message ‘Undetermined meter’ and a lot of warning messages ‘The state variable stand_July24_1/Circuit/4/L2 is redundant and will be eliminated from the equation system. Its initial value (0) will be ignored.’

I wonder whether the error and warnings came from the ideal dc source ,can anyone help me ?

I just changed the topology of the circuit and the error disappears

I found that it’s just a problem of whether meter or circuit is connected to the ground.