Truble with "Slay Doctor Lucke" in Extension Intelligent Hi"

When trying example "Slay Doctor Lucky] the compiler returns message. Does anyone have a fix for this?

The game defines blackmail material (in the singular) rather than blackmail materials (in the plural), so it’s an easy fix:

Requirements for Destroying-The-Evidence: do the action of inserting blackmail material into fireplace. Definition: Destroying-The-Evidence is complete if the material is off-stage.