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Flutter: Error trying to pass a value to another class

I am trying to pass a value (the current index number of my ListView.builder) to another function. However I get the following error: ════════ Exception caught by widgets library ═══════════════════════════════════ The following RangeError was thrown building BookFeederSearch(dirty, dependencies: [_InheritedProviderScope<UserProvider?>], state:…

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