Cannot get "List.GetItemAtIndex" to work on a nested array (nested list)

Lists-Logic
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I probably don’t understand data structure in dynamo yet (second day using it). I ran into a problem though, I cannot seem to get item index from anything except a very simple list. A list with an additional data tree breaks the getItemIndex component, causing it to error “Index out of range”. I believe that the index is in range however, and I am misunderstanding something. Please advise! How would you go about using this component in this situation? I would like to get the items with the indexes below from the list above. Thank you for your time.

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Revit and script file are available here: https://www.dropbox.com/sh/gibeh1rxadmj7a5/AABoQxLXrBcg3es3GAHKKSPma?dl=0 (forum won’t let me upload as I am a new user)

I also read this, and seems relevant:

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Hello Nick,

Thank you for your reply. I believe I’m doing the same thing you are; the data is nearly identical. I tried a more reduced example but still can’t get it to work. What am I doing wrong?

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What version of dynamo are you using? Nick enabled list at level feature but you appear to be an older version and not have the feature.

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Try changing Lacing to Longest20170817-2

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I was using 0.9; could this be the issue? Attempting to upgrade to 1.2.l I believe that this is the issue since list@level was introduced in 1.2. Thank you so much! Will report back if it works

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That would be the issue. I believe 1.2 should enable the feature.

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Yes, I had the computers upgraded to 1.2 and now the @L2 option works. I thought I’d have to write a python node to loop through the list.

Thank you!