thisComp is not defined.

Hey, all!

I'm having a problem with an expression in After Effects. What I want to do is make one shape scale up after the layer under it, with a few frames of delay. Think a sheet of hexagons growing out from one point on the screen.

I've found this expression to do it:

var S=thisComp.layer(index+1).transform.scale;
var D=thisComp.layer("Adjustment Layer").effect("Slider Control")("Slider")*thiscomp.frameDuration;
S.valueAtTime(time-D)

However, I keep getting this message:

After Effects warning: Expression Disabled

Error at line 1 in property 'Scale' of layer 26("2") in comp 'First Line".

ReferenceError: thiscomp is not defined

What am I doing wrong? How would I even define thisComp? I thought it would just indicate the current composition layer.

Please help! Thanks.