this error appear when i run the code

[jasonleewimi]

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.
Check the render method of App.

This error is located at:
in App (created by ExpoRoot)
in ExpoRoot (at renderApplication.js:45)
in RCTView (at View.js:34)
in View (at AppContainer.js:106)
in DevAppContainer (at AppContainer.js:121)
in RCTView (at View.js:34)
in View (at AppContainer.js:132)
in AppContainer (at renderApplication.js:39)

• node_modules/react-native/Libraries/LogBox/LogBox.js:148:8 in registerError
• node_modules/react-native/Libraries/LogBox/LogBox.js:59:8 in errorImpl
• node_modules/react-native/Libraries/LogBox/LogBox.js:33:4 in console.error
• node_modules/expo/build/environment/react-native-logs.fx.js:27:4 in error
• node_modules/react-native/Libraries/Core/ExceptionsManager.js:104:6 in reportException
• node_modules/react-native/Libraries/Core/ExceptionsManager.js:171:19 in handleException
• node_modules/react-native/Libraries/Core/setUpErrorHandling.js:24:6 in handleError
• node_modules/expo-error-recovery/build/ErrorRecovery.fx.js:9:32 in ErrorUtils.setGlobalHandler$argument_0
• node_modules/regenerator-runtime/runtime.js:63:36 in tryCatch
• node_modules/regenerator-runtime/runtime.js:293:29 in invoke
• node_modules/regenerator-runtime/runtime.js:63:36 in tryCatch
• node_modules/regenerator-runtime/runtime.js:154:27 in invoke
• node_modules/regenerator-runtime/runtime.js:164:18 in PromiseImpl.resolve.then$argument_0
• node_modules/react-native/node_modules/promise/setimmediate/core.js:37:13 in tryCallOne
• node_modules/react-native/node_modules/promise/setimmediate/core.js:123:24 in setImmediate$argument_0
• node_modules/react-native/Libraries/Core/Timers/JSTimers.js:130:14 in _callTimer
• node_modules/react-native/Libraries/Core/Timers/JSTimers.js:181:14 in _callImmediatesPass
• node_modules/react-native/Libraries/Core/Timers/JSTimers.js:441:30 in callImmediates
• node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:387:6 in __callImmediates
• node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:135:6 in __guard$argument_0
• node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:364:10 in __guard
• node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:134:4 in flushedQueue

• [native code]:null in flushedQueue
• [native code]:null in invokeCallbackAndReturnFlushedQueue

[akshayverma]

This is related to incompatibility between versions of expo.

Try upgrading expo to latest version by

expo upgrade

and then change the import for AppLoading in App.js to

npm install expo-app-loading
import AppLoading from 'expo-app-loading';