An error occurred while running the simulation and the simulation was terminated

Caused by: The model may not give enough information to make it possible to solve for values of some of its variables. Specific advice is given below. all components and nodal across variables involved Tie variable \\’Voltage_Sensor.p.v\\’ (Voltage) to a definite value, for example by connecting an appropriate domain reference block. Dependency found among topology equations. Check for missing reference node.