Annoying "Choose Application" Popup

I recently upgraded from a Late 2013 MacBook Pro to a new Mid 2018 model. A clean install had gotten rid of a lot of issues, except for one...an annoying popup whenever I open a rule. A screenshot is below.

I've tried to navigate to Hazel in the PreferencePanes folder to select HazelHelper; however, Hazel.prefPane is grayed out.

Any assistance anyone can provide to suppress this popup will be greatly appreciated...

Are you running AppleScript for the rule in question? That looks like the pop-up for choosing an AppleScript dictionary.

Yes, I run AppleScript in many rules: however, the popup appears only when a script within a rule references Hazel as below. Note the popup specifically asks Where is hazel?

tell application "hazel"
delay 5
end tell

I use the script to slow down the running of the rule. Can you suggest a different script that would accomplish the same thing without invoking the Hazel name?

Hazel can't be AppleScripted in that way. You should try it without the "tell" or if it is for some reason required, try using System Events instead.

Using System Events fixed the issue. Thank you for your support...