Question: I am making a 4 bit digital calculator project. I have a problem in mainCircuit. In ALU circuits, there are 1 0 pins on the

I am making a 4 bit digital calculator project. I have a problem in mainCircuit. In ALU circuits, there are 10 pins on the top(9th pin has 2bit and 10th pin has 1 bit. The circuit on the top-right side of ALU is ControlUnit which has two 1-bit control pins. On the bottom-right side of ALU is OutputInterface which has four 1-bit pins. When I connect them, the wires turn out blue. What is the problem with them?
 I am making a 4 bit digital calculator project. I have

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