After I updated to Mojave, I can no longer use the automator service I\'ve previously been using with the alert below.
I had a similar error running AppleScript .app applications. I received the following error:
Not authorized to send Apple events to Finder. (-1743)
A workaround is to export (File > Export) or save (File > Save As, holding Option key to show Save As) a new Application from the .scpt or .applescript source code. This generates a new .app application, which in my case ran successfully. The initial launch required approval (as well as some subsequent launches), and the application was added as an entry under Settings -> Security & Privacy -> Privacy -> Automation.