Web Reference: Jan 2, 2026 · In this blog, we’ll demystify this error, explore why it happens, and walk through step-by-step solutions to fix it. By the end, you’ll understand how to properly annotate function types in Flutter and avoid similar issues in the future. Aug 3, 2020 · Try checking to see if you're using the correct API; there might be a function or call that returns void you didn't expect. Also check type parameters and variables which might also be void. Apr 2, 2025 · Learn how to create an inline anonymous function in Flutter to avoid the common `void Function ()` assignment error. Simplify your code while maintaining functionality with these easy steps.
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