BTT AppleScript Error: The command terminated due to receipt of a signal.

I was working on implementing something similar to this tutorial on adding a current calendar event to BTT and I ran into an interesting problem.

When I run do shell script "/usr/local/bin/icalBuddy"I get the output of the cli manual (exactly as expected), but if I attempt to run icalBuddy commands that I know work, I get a dialog box that says:

AppleScript Error: The command terminated due to receipt of a signal.

This occurs even with even the most basic command like do shell script "/usr/local/bin/icalBuddy eventsToday"

Any ideas?