ListViewの中に、GridViewをそのまま入れると、エラーになります。
The following assertion was thrown during performResize():
Vertical viewport was given unbounded height.Viewports expand in the scrolling direction to fill their container. In this case, a vertical viewport was given an unlimited amount of vertical space in which to expand. This situation typically happens when a scrollable widget is nested inside another scrollable widget.
If this widget is always nested in a scrollable widget there is no need to use a viewport because there will always be enough vertical space for the children. In this case, consider using a Column instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size the height of the viewport to the sum of the heights of its children.
これの解決方法です。
解決方法
入れ子の中にいれるGridViewに以下のプロパティを設定することで解決します。
shrinkWrap: true, physics: NeverScrollableScrollPhysics(),