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Assertion failed: package:flutter/…/rendering/box.dart:1930 hasSize "RenderBox was not laid out: RenderRepaintBoundary#7e1b3 NEEDS-PAINT Code Example
Assertion failed: package:flutter/…/rendering/box.dart:1930 hasSize "RenderBox was not laid out: RenderRepaintBoundary#7e1b3 NEEDS-PAINT 
You're trying to use ListView.builder in a FutureBuilder which has no sizes in a Column, so you need to constrain it somehow – either with SizedBox(height: 300, child: ListView.builder()) or with Expanded widget

Check out this article https://flutter.dev/docs/development/ui/layout/constraints



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