起源于下图这个三角叹号：
解决方法：
Scroll View --Viewport ----Content [Content Size Fitter] Vertical Fit: Preferred Size [Vertical Layout Group] Control Child Size: W/H Child Force Expand: W/H ------Prefab [Vertical Layout Group] Control Child Size: W/H Child Force Expand: W/H --------TMP --------Image [Layout Element] Min Height:20 --------TMP --------TMP --------TMP
来源于链接25楼：https://forum.unity.com/threads/layout-group-and-contentsizefitter-in-child.343082/
还有个聊天框显示方案：https://stackoverflow.com/questions/53059487/unity3d-parent-has-a-type-of-layout-group-error
所以勾上 Control Child Size: W/H 试试