Flutter: "Incorrect use of ParentDataWidget" exception when wrapping an Expanded in a GestureDetector

Disclaimer: I'm relatively new to Flutter, so I am not fully clear on some of the constraints related to what widget "can" go into which other widget, so this may be a simple mistake... I appreciate everyone's patience and guidance!

Hi everyone! :)

I'll start with the change that leads to the error:

GestureDetector(  child: Expanded(    child: Text(      displayTime ? "Some text" : "Some other text"      style: textStyle),    ),   onTap: () { // No code yet here    },),

With the above code, I get the "Incorrect use of ParentDataWidget" exception, right after wrapping the Expanded in a GestureDetector. If I remove the GestureDetector, the app works fine.

The widget this sits in is in the following tree:Widget Tree of the widget where the GestureDetector sits

This Widget, itself, sits in the following tree (TaskBubble):View of where the problematic widget sits in

Now, I could always work around this and find another way to get that onTap(), but I'd rather understand the issue to fix it for good.

I've tried the following:

1. Removing the GestureDetector - which removes the exception
2. Removing the Expanded - and it works, but then I'm not getting the layout I want - i.e. a Text field expanding between two other widgets in a row
3. Understanding whether my Widget tree choices are correct (i.e., roughly: ListView, Row, Widget, Row, GestureDetector, Expanded tree) - but I can't find anything conclusive at this point.

Thanks for the support!

Cheers!