Scripting - Get layer when in a group

[Desbrina]

So i know i can use the below to get a layer

var layerName = "Text BG";
app.activeDocument.activeLayer = layers[layerName];

This works fine when the layer isn't within a group, but if it is I get an error

Error 1302: No such element

Line: 53 ->  app.activeDocument.activeLayer = layers[layerName];

The layer is within a group called Text Group, how do i go about getting the group correctly?

[Kukurykus]

layers is undefined

[Desbrina]

Layers is fine, as i said it works fine if the layer isn't in a group.

Layers is defined using

var layers = app.activeDocument.layers;

earlier in the script

[Kukurykus]

with(activeDocument)
	activeLayer = layerSets['Text Group'].artLayers['Text Bg']

[Stephen Marsh]

@Desbrina I believe that @Kukurykus has provided one possible solution which you can mark as the correct answer. 

In my journey of learning scripting, I have collected various useful snippets. The last example in this link uses layer index:

https://gist.github.com/MarshySwamp/229a0676666a44cdaa007da1cfddc0b7

The following is basically the same as the reply from Kukurykus with a slightly different syntax, swapping the layer index numbers in the GitHub Gist example above for names. 

activeDocument.activeLayer = activeDocument.layerSets["Text Group"].layers["Text BG"];

[Chuck Uebele]

Yes, as the others have mentioned, you need to select the group to get the layer within it.