RenderBox was not laid out: _RenderSingleChildViewport#e3d2a relayoutBoundary=up8 NEEDS-PAINT 'package:flutter/src/rendering/box.dart': Failed assertion: line 1694 pos 12: 'hasSize' The relevant error-causing widget was: SingleChildScrollView file:///Users/vladimir_ivanov4/Projects/poc/flutterPoc/ap_poc/lib/main.dart:113:16