Invariant violation: requirenativecomponent: “fastimageview” was not found in the uimanager.

Query – Invariant Violation: requireNativeComponent: “FastImageView” was not found in the UIManager.

This error typically occurs in React Native apps when a native component (in this case, “FastImageView”) is required but not found in the native modules registered with the UIManager.

To resolve this error, you can follow the steps below:

1. Check the package name and import:
   Make sure the package name and import for the “FastImageView” component are correct. Ensure that the component is imported from the right package and that the package is properly installed in your project’s dependencies.
2. Rebuild the native dependencies:
   If you have recently added the “FastImageView” package or made changes to your project’s native code, you might need to rebuild the native dependencies. This can be done by running the appropriate commands for your development platform, such as “react-native run-android” for Android or “react-native run-ios” for iOS.
3. Clear cache and reinstall:
   Sometimes, clearing the React Native cache and reinstalling the project’s dependencies can help resolve this error. You can do this by running the following commands:
   
npx react-native start --reset-cache
rm -rf node_modules
npm install

4. Ensure proper linking:
   If the “FastImageView” package requires manual linking, make sure you have properly linked the package to your project. Check the package documentation for any specific instructions on linking.
5. Double-check native code changes:
   If you have made changes to the native code of your project (e.g., modifying MainActivity.java for Android or AppDelegate.m for iOS), ensure that the changes are correct and do not interfere with the registration of native modules.

It’s essential to review your project’s setup, dependencies, and any recent changes to resolve this error properly. By following the steps above and carefully inspecting the problem, you should be able to fix the “Invariant Violation: requireNativeComponent” error in your React Native app.

Example:
Suppose you have installed the “react-native-fast-image” package to use the “FastImageView” component. You would import and use it in your React Native code as follows:


import FastImage from 'react-native-fast-image';

const MyComponent = () => (
       style={{ width: 200, height: 200 }}
    source={{uri: 'https://example.com/image.jpg'}}
  />
);