Rig a spine, script error

Rig a spine, script error
ramjet36
I am trying to rig my first figure. I don't do too bad untill I have to write script. I am using Max 8 tutorial and am trying to (Rig Spine) (Add controls to twist the spine:)

I click:
IK_Spline_Goal
Assign Controller
Twist Start Angle
Assign Script Controller
Float Script

Then in the SCRIPT Controller Box. I delete the 0 and copy and paste the script into Expression window.

When I close I get UNKNOWN PROPERTY: "controler" in undefined.

Does anyone know about this script. I wish I did.

Kind Regards
Rog