The cause of this message can be varied:
•A macro token that is inside a minicalendar and uses system variables that refer to the parent minicalendar.
•Any other token whose evaluation depends on its context (ie. which other tokens appear before it. This cannot be previewed as the script preview evaluates tokens one by one independently of each other.
Note that this message does not mean that there is an error in your token, it just means that it cannot be previewed in the script preview.
Topic 171900, last updated on 19-Apr-2020