Piyush Rajput · 18 Dec 2024 · 770 views

React Native Common Errors

React Native is great for building mobile apps, but if you are a new developer you may face some errors like “undefined is not an error” or dependencies errors. Incorrect dependencies and navigation mistakes cause most issues.

This blog we'll cover simple solutions to the most common React Native problems to help you fix them quickly and keep your projects running smoothly.

List of Common Errors in React Native

1.) Invariant Violation : Text strings must be rendered within a <Text> component.

Cause:- This happens when in-plane string(text) returns and is used directly within the JSX without wrapping in the <Text> component.

Solution:- Ensure that all the text (content) is wrapped inside a <Text> component.

2.) Module AppRegistry is not a registered callable module

Cause:- When you run/create your new application, you might see the error, “Module AppRegistry is not a registered callable module.” This usually happens because the app name in your app.json file is incorrect or it can be the cache error.

Solutions:-

a). Go to the terminal and run these command

FOR ANDROID

	cd android
	./gradlew clean
	cd ..
	npx react-native run-android

	cd android
	./gradlew clean
	cd ..
	npx react-native run-android

FOR IOS

	cd ios
	pod install

	cd ios
	pod install

(b). npx react-native start –-reset-cache

(b). npx react-native start –-reset-cache

Note:- If the above solution is not working then “Please check the root folder name, if it contains space, remove them.”

3.) “Undefined is not an object” error in React Native.

Cause:- The error “Undefined is not an object” means you are trying to use something that has not been properly defined. Check the error message to see which variable or property is causing the issue.

Solution:-

(a). Use the debugging tool

(b). Ensure the object is properly defined and initialised.

(c). Provide default values for props, and state or destructured objects.

(d). Validate data from APIs and handle errors gracefully.

(e). Use console.log() statement to verify the object values at runtime.

4.) The action ‘NAVIGATE’ with payload ****** was not handled by any navigator.

Cause:- This error may occur if you are using the wrong path (wrong screen name) or if the screen name is not declared in the navigator.

Solution:-

(a). You need to check the screen name spelling.

(b). Check the screen is declared in the navigator.

(c). Check the screen name matches the one defined in the navigator.

5.) The development server returned response error code:500

Cause:-

(a). This error may occur when the metro bundle is not running.

(b). Syntax error code issues.

(c). Dependency installation or module issue.

(d). Metro bundle cache issue.

Solution:- Go to the terminal and run these command:

npx react-native start –-reset-cache

npx react-native start –-reset-cache

If above command is not working

FOR ANDROID

cd android
./gradlew clean
cd ..
npx react-native run-android

cd android
./gradlew clean
cd ..
npx react-native run-android

FOR IOS

Go to XCode

Clean the project

And run project

Alternative ans:-

Delete the node modules & package-lock.json file

Go to the ios folder

And delete the Pods & Podfile.lock

Go to the terminal and run these command in root folder

npm install
cd ios
pod install
cd ..
npx react-native run-android
npx react-native run-ios

npm install
cd ios
pod install
cd ..
npx react-native run-android
npx react-native run-ios

Conclusion:-

(a). Go to the terminal and run these command

For android

cd android
./gradlew clean
cd ..
cd ios
pod install
npx react-native run-android
npx react-native run-ios

Alternative

Here is the Code:-

npx react-native start –-reset-cache

npx react-native start –-reset-cache

Hope you like this blog, if you have any questions do let us know in the comment section.