In my LabVIEW block diagram, I usually enter in numbers, e.g. 0,1,2 for the channel string input of AI Config. When I try to use a virtual channel, I simply type in the virtual channel, e.g. 0,K Thermocouple,2. However, this causes AI Group Config Error 10001, which applies to an invalid channel string. What is the correct way to enter a virtual channel into the channel string?