Hello Muhammad. Greetings.
I have also come across such error messages a lot times and i believe it has to be related to some logical error. Dhiman & co has correctly put that Binary output should be connected to binary input, Electrical output should be connected to electrical input and Optical output should be connected to Optical input. You might be doing something wrong with the connections i guess so because it happened to me as well.
Regards
Atul Sharma