Driver Question

I’m working from Hess’ Blender Foundatons, trying to set up a driver but can’t get it to work. I’ve added the constraints I want the driver to affect, and they work by themselves. I copied the data path of the armature’s custom property into the new driver and set it up as the book instructs me to, but sliding the influence of the custom property doesn’t have an affect. The driver does say “ERROR invalid target channel” but I don’t know how to fix it

I’ve tried fiddling with the x and y values down below, like if I set it to y:0.5 and x:1.0 it affects it half way, but the slider still doesnt work. am I missing something?

Fixed, needed to set it to Single property and Armature. Maybe it’s updated since the book


DriverTest.blend (357 KB)