I spoke with an Apps Engineer about this because I wasn't sure if this was possible.
In general, Creator doesn't support directly connecting a single bit to a bus input signal. The error your seeing is Creator reporting that the input terminal on the AND gate has unconnected signals.
I've attached a schematic image for reference. In the attached, we used intermediate logic to create a bus for the input on the AND gate. When you build, all this intermediate logic is optimized out.
The assumption is that the other input on the AND gate is a bus for a specific reason. Here, we just used a Pins component configured with 3 pins.
Hope this helps!
not_and_schematic.jpg 176.7 K
That works, thanks.