Simulink Line connection error

I keep getting this error when I try to connect two port , for example I want to connect GND to (-) port of the voltage measurement. But I can't because I get this red dot line. How can I fix this please help thank you.

Answer 1

[Fangjun Jiang]

You might need this "Ground" block.

https://www.mathworks.com/help/simulink/slref/ground.html

Not the "Ground" block from SimScape

https://www.mathworks.com/help/sps/powersys/ref/ground.html

[Hanife Sahin]

Thank you so much! It worked