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AppleScript error: Can't make (handler) into type string

If you ever get the following error message in an AppleScript program (at least while editing the program in the ScriptEditor):

Can't make (handler) into type string

fear not, it seems to be pretty simple to cure. In my case I got this more-specific error message:

Can't make (handler getDayOfWeek) into type string

This error just means that I tried to call a function like this: