Select Shortcuts in a Hazel Rule

Hi
I am trying to a shortcut as part of a hazel rule but I cannot select the short cut. All available shortcuts are greyed out in the drop menu - any idea how to fix this?
Thank you
I am trying to a shortcut as part of a hazel rule but I cannot select the short cut. All available shortcuts are greyed out in the drop menu - any idea how to fix this?
Thank you