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bug Unhandled Exception: setState() called after dispose(): _DemoButton

2

thanks your perfect ui framework. when i run demo,i get such error: E/flutter (20403): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: setState() called after dispose(): _DemoButton#3b59a(lifecycle state: defunct, not mounted) E/flutter (20403): This error...