One of the modifiers in the file was renamed. All I did was reference the modifier I needed by index instead of by name.

All you need to do is change some text in the script controller. Just dismiss the warning window (hit OK), and copy/paste the following script to the script controller editor:.

dependsOn $Null_clavRotRefRT $IKControl_armRT.modifiers[2]

refObjRot = ($Null_clavRotRefRT.transform.rotation)
xComp = -(refObjRot as eulerangles).x + 0.0256758
yComp = -(refObjRot as eulerangles).y + 3.2048
Zcomp = -(refObjRot as eulerangles).z - 0.145004

xRot = xComp * $IKControl_armRT.modifiers[2].AutoClav_X
yRot = yComp * $IKControl_armRT.modifiers[2].AutoClav_Y
zRot = zComp * $IKControl_armRT.modifiers[2].AutoClav_Z

angRot = eulerangles xRot yRot -zRot
angRot