Validating object specifier?

I’m curious what’s going on with this little indefinite progress window that pops up in the below script, and only in the below script, after it finishes all its work but before the script stops execution. The script runs just fine and the results are exactly as expected, it’s just that this weird window pops up that I’ve never seen before.

Anybody have any idea what’s up with this?

First, my script:

use AppleScript version "2.4" -- Yosemite (10.10) or later
use scripting additions

-- grab calculated dates from Excel
tell application "Microsoft Excel"
	tell active sheet of active workbook
		set reminderDates to value of range "A:.A"
	end tell
end tell

-- get rid of the first item
set reminderDates to the rest of reminderDates

-- create reminders for the remaining items
tell application "Reminders"
	tell list "Meds"
		repeat with aDate in reminderDates
			set aDate to item 1 of aDate
			make new reminder at end with properties {name:"Simon - meds", due date:aDate}
		end repeat
	end tell
end tell

The range I’m reading from Excal is just a list of dates and times:

Screenshot 2025-04-24 at 13.28.40

This is on Sequoia 15.4.1, by the way.

I’ve seen that dialog fairly often. I believe Script Debugger displays it when one of the global variables has a reference that takes a long time to resolve or resolves to a very large list.

Hmm, but I don’t get it. There aren’t more than about 8-11 items and according to the log all the work to create the reminders has been completed by the time this dialog shows up. So what is it trying to resolve?

Sometimes the application can take a long time to respond to the Apple Event. As I said, it’s a dialog I see not infrequently in different contexts, so I don’t think it indicates anything untoward on your machine.