Hi!
There is a very simple import where the end-user checks a boolean for the items they want to keep in a subset and then runs an action that takes the boolean value to the list and updates the subset. Clean and straight.
However, user is not getting a peculiar error. Can you help me understand the reason behind this error:

Just to be clear, the user was adding only 3 items in the subset and not the cell count value being shown in the error.