Error: Undefined value used in expression (could be an out of range array subscripte?)

Question

Hello,help me please. 
I am making an animation of a chart bar that changes its size and color depending on the value. 
I used the slider control, I tied everything, the size changes depending on the value, 
but it doesn't work at all with the color. It keeps giving the same error
Error: Undefined value used in expression (could be an out of range array subscripte?)
The error appears at 70%. But he always chooses the wrong color.
Please help me, how to solve this problem?

Dan Ebberts · Accepted Answer

The key to that type of cascading logic is using else if, like this:

r = thisComp.layer("test").effect("Slider Control")("Slider");
if (r <= 30)
  effect("low")("Color")
else if (r < 70)
  effect("Middle")("Color")
else
  effect("High")("Color");

Mylenium · Answer

Your code also makes no sense because the compare operator for the 70% rule is the wrong way, so the criteria is never met. It has to be >=, not <=. Also consider actually polishing yoru sloppy code. If statements are supposed to have else{} fallbacks and the new expression engine is sensitive to that. Refer to this:

Syntax differences between the JavaScript and Legacy ExtendScript expression engines in After Effects 16.0.

Mylenium

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