Operation add items to list cannot accept arguments

I am trying to develop a simple app for a family member to keep track of when they have eaten a piece of candy. The user simply clicks the button Candy and the app should call the Clock to add the timestamp to both the Time label and the CandyHistory list. Output to the Time label works fine, but I cannot get the timestamp added to the list. I have spent hours looking around at examples and cannot figure out what I am doing wrong. Thanks so much for your help!

you are adding items to an string that saved in Tiny DB... just replace this block :point_down: with variable below