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usestate,useEffect 코드스니펫오류
[왕초보] 나만의 수익성 앱, 앱개발 종합반
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3주차 usestate,useEffect 코드스니펫을 복사하여 붙여넣기하였는데 오류가 발생하고있습니다.




스파르타 즉문즉답





작성한 코드 및 에러 메세지

Android Running app on SM-G986N


Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: %s.%s%s, object, 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 `ExpoRoot`., 

  in ExpoRoot

  in RCTView (created by View)

  in View (created by AppContainer)

  in RCTView (created by View)

  in View (created by AppContainer)

  in AppContainer

  in main(RootComponent)

at node_modules\expo\build\environment\react-native-logs.fx.js:null in error

at node_modules\react\cjs\react.development.js:null in printWarning

at node_modules\react\cjs\react.development.js:null in error

at node_modules\react\cjs\react.development.js:null in createElementWithValidation

at node_modules\expo\build\launch\withExpoRoot.js:null in ExpoRoot

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in renderWithHooks

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in mountIndeterminateComponent   

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in beginWork$1

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in performUnitOfWork

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in workLoopSync

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in renderRootSync

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in performSyncWorkOnRoot

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in flushSyncCallbacks

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in flushSyncCallbacksOnlyInLegacyMode

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in scheduleUpdateOnFiber

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in updateContainer

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in render

at node_modules\react-native\Libraries\ReactNative\renderApplication.js:null in renderApplication

at node_modules\react-native\Libraries\ReactNative\AppRegistry.js:null in runnables.appKey.run

at node_modules\react-native\Libraries\ReactNative\AppRegistry.js:null in runApplication

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __callFunction

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard$argument_0

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in callFunctionReturnFlushedQueue


Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. 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 `ExpoRoot`.


This error is located at:

  in ExpoRoot

  in RCTView (created by View)

  in View (created by AppContainer)

  in RCTView (created by View)

  in View (created by AppContainer)

  in AppContainer

  in main(RootComponent)

at node_modules\expo\build\environment\react-native-logs.fx.js:null in error

at node_modules\react-native\Libraries\Core\ExceptionsManager.js:null in reportException

at node_modules\react-native\Libraries\Core\ExceptionsManager.js:null in handleException

at node_modules\react-native\Libraries\Core\ReactFiberErrorDialog.js:null in showErrorDialog

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in logCapturedError

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in update.callback

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in callCallback

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitUpdateQueue

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitLayoutEffectOnFiber    

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitLayoutMountEffects_complete

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitLayoutEffects_begin    

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitLayoutEffects

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitRootImpl

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in commitRoot

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in performSyncWorkOnRoot

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in flushSyncCallbacks

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in flushSyncCallbacksOnlyInLegacyMode

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in scheduleUpdateOnFiber

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in updateContainer

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in render

at node_modules\react-native\Libraries\ReactNative\renderApplication.js:null in renderApplication

at node_modules\react-native\Libraries\ReactNative\AppRegistry.js:null in runnables.appKey.run

at node_modules\react-native\Libraries\ReactNative\AppRegistry.js:null in runApplication

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __callFunction

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard$argument_0

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in callFunctionReturnFlushedQueue


Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: %s.%s%s, object, 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 `ExpoRoot`., 

  in ExpoRoot

  in RCTView (created by View)

  in View (created by AppContainer)

  in RCTView (created by View)

  in View (created by AppContainer)

  in AppContainer

  in main(RootComponent)

at node_modules\expo\build\environment\react-native-logs.fx.js:null in error

at node_modules\react\cjs\react.development.js:null in printWarning

at node_modules\react\cjs\react.development.js:null in error

at node_modules\react\cjs\react.development.js:null in createElementWithValidation

at node_modules\expo\build\launch\withExpoRoot.js:null in ExpoRoot

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in renderWithHooks

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in mountIndeterminateComponent   

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in invokeGuardedCallbackProd    

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in invokeGuardedCallback

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in beginWork$1

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in performUnitOfWork

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in workLoopSync

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in renderRootSync

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in performSyncWorkOnRoot

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in flushSyncCallbacks

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in flushSyncCallbacksOnlyInLegacyMode

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in scheduleUpdateOnFiber

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in updateContainer

at node_modules\react-native\Libraries\Renderer\implementations\ReactNativeRenderer-dev.js:null in render

at node_modules\react-native\Libraries\ReactNative\renderApplication.js:null in renderApplication

at node_modules\react-native\Libraries\ReactNative\AppRegistry.js:null in runnables.appKey.run

at node_modules\react-native\Libraries\ReactNative\AppRegistry.js:null in runApplication

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __callFunction

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard$argument_0

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in callFunctionReturnFlushedQueue


Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object. 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 `ExpoRoot`.


This error is located at:

  in ExpoRoot

  in RCTView (created by View)

  in View (created by AppContainer)

  in RCTView (created by View)

  in View (created by AppContainer)

  in AppContainer

  in main(RootComponent)

at node_modules\expo\build\environment\react-native-logs.fx.js:null in error

at node_modules\react-native\Libraries\Core\ExceptionsManager.js:null in reportException

at node_modules\react-native\Libraries\Core\ExceptionsManager.js:null in handleException

at node_modules\react-native\Libraries\Core\setUpErrorHandling.js:null in handleError

at node_modules\expo\build\errors\ExpoErrorManager.js:null in errorHandler

at node_modules\expo\build\errors\ExpoErrorManager.js:null in <anonymous>

at node_modules\expo-error-recovery\build\ErrorRecovery.fx.js:null in ErrorUtils.setGlobalHandler$argument_0

at node_modules\@babel\runtime\helpers\asyncToGenerator.js:null in asyncGeneratorStep

at node_modules\@babel\runtime\helpers\asyncToGenerator.js:null in _next

at node_modules\promise\setimmediate\core.js:null in tryCallOne

at node_modules\promise\setimmediate\core.js:null in setImmediate$argument_0

at node_modules\react-native\Libraries\Core\Timers\JSTimers.js:null in _allocateCallback$argument_0

at node_modules\react-native\Libraries\Core\Timers\JSTimers.js:null in _callTimer

at node_modules\react-native\Libraries\Core\Timers\JSTimers.js:null in _callReactNativeMicrotasksPass

at node_modules\react-native\Libraries\Core\Timers\JSTimers.js:null in callReactNativeMicrotasks

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __callReactNativeMicrotasks

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard$argument_0

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in __guard

at node_modules\react-native\Libraries\BatchedBridge\MessageQueue.js:null in flushedQueue





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