Expression errors: Project created on a Mac and now opened on Windows

[Lea5C8C]

I have a 21 expression errors in my file with one of the following descriptions:

• "Bad argument: index out of range"
• "Object of type Group found where a number, array or property is needed"

I tried to change the "Expressions Engine" but that didn't help. The file with the extensions was created on a Mac and I am trying to edit in on a Windows Computer. Maybe that could be an issue. Moreover "thisComp.layer" is used in the file which I think could cause issues as well. 

What can I do to solve this? When the file is opened on a Mac it works.

[Mylenium]

This looks like the whole thing was created using some script or panel and it created a pseudo effect. If that's the case, then of course the index at the end won't be correct. You will have to install the pseudo effect preset or fix the expression. The index is always 1 since expression controls are always singular.

Mylenium 

[Dan Ebberts]

It would probably help to see a screen shot of the Effect Controls panel for layer CONTROL PANEL.

[Lea5C8C]

Here is a screenshot.

[Dan Ebberts]

It looks like it's trying to access the Effect Opacity Compositing Option, but I don't think you can do it that way, with (3). I think this would work, if that's really what it's after:

thisComp.layer("CONTROL PANEL").effect("Graphic Elements - Color").compositingOption.effectOpacity