Firebase 오류 16 UNAUTHENTICATED: Failed to retrieve auth metadata with error: invalid_grant

>  Error: 16 UNAUTHENTICATED: Failed to retrieve auth metadata with error: invalid_grant
>      at Object.callErrorFromStatus (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@grpc\grpc-js\build\src\call.js:31:26)
>      at Object.onReceiveStatus (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@grpc\grpc-js\build\src\client.js:179:52)
>      at Object.onReceiveStatus (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@grpc\grpc-js\build\src\client-interceptors.js:336:141)
>      at Object.onReceiveStatus (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@grpc\grpc-js\build\src\client-interceptors.js:299:181)
>      at C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@grpc\grpc-js\build\src\call-stream.js:145:78
>      at processTicksAndRejections (internal/process/task_queues.js:79:11)
>  Caused by: Error
>      at WriteBatch.commit (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@google-cloud\firestore\build\src\write-batch.js:417:23)
>      at DocumentReference.create (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@google-cloud\firestore\build\src\reference.js:295:14)
>      at CollectionReference.add (C:\Users\Smart\Project_jg\Cloud functions\functions\node_modules\@google-cloud\firestore\build\src\reference.js:2090:28)
>      at createProgram (C:\Users\Smart\Project_jg\Cloud functions\functions\scheduleManager.js:263:6)
>      at C:\Users\Smart\Project_jg\Cloud functions\functions\scheduleManager.js:319:28
>      at processTicksAndRejections (internal/process/task_queues.js:97:5) {
>    code: 16,
>    details: 'Failed to retrieve auth metadata with error: invalid_grant',
>    metadata: Metadata { internalRepr: Map {}, options: {} },
>    note: 'Exception occurred in retry method that was not classified as transient',
>    statusDetails: []
>  }

이 오류가 발생하기 전 구글에 로그인 되어있는 기기 중 필요치 않아 보이는 기기들을 로그아웃 시켜줬다.

 

firebase emulator에 연결되어 있던 계정까지 날려버려서 이 오류가 발생하게 되었다.

그냥 간단하게 firebase logout 한다음에 다시 로그인 해주면 해당 오류가 발생하지 않는것을 확인할 수 있다.