New Contributor
Super ContributorThe problem is in your top level schematic. You're doing bit slicing for the wires (inputs and outputs), but you haven't named the wires, so the tool has no idea how to connect the inputs to "a" and the result outputs to the LEDs. To fix this, right-click the wires connected to the switch inputs and LED outputs, and open the wire properties. Give each one a name that matches the appropriate bits, like a[0], a[1], result[3], etc. You could also instead change the names of the inputs and outputs themselves to these names. Also, you have 5 LED outputs connected to a 4-bit bus, so I'm not sure what's going on there.
Once the names match, the tool will know which bits to connect to which I/O. That's the problem with the design as it stands right now.
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