'java.lang.String com.dropbox.core.DbxRequestConfig.getUserLocale()' on a null object reference

Login with dropbox account I got crash.
implementation 'com.dropbox.core:dropbox-core-sdk:4.0.1'
Api level 30

My Code :

`public class DbxRequestConfigFactory {`
` private static DbxRequestConfig sDbxRequestConfig;`
` public static DbxRequestConfig getRequestConfig() {`
` if (sDbxRequestConfig == null) {`
` sDbxRequestConfig = DbxRequestConfig.newBuilder("myapp-dropbox-v2")`
` .withHttpRequestor(new OkHttp3Requestor(OkHttp3Requestor.defaultOkHttpClient()))`
` .build();`
` }`
` return sDbxRequestConfig;`
`}`
`}`

`Auth.startOAuth2PKCE(this, getString(R.string.app_key),DbxRequestConfigFactory.getRequestConfig());`

Logs below

Fatal Exception: java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$4.done(AsyncTask.java:399)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)

Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.dropbox.core.DbxRequestConfig.getUserLocale()' on a null object reference
at com.dropbox.core.DbxPKCEManager.makeTokenRequest(DbxPKCEManager.java:107)
at com.dropbox.core.android.AuthActivity$TokenRequestAsyncTask.doInBackground(AuthActivity.java:793)
at com.dropbox.core.android.AuthActivity$TokenRequestAsyncTask.doInBackground(AuthActivity.java:782)
at android.os.AsyncTask$3.call(AsyncTask.java:378)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)

Bắt đầu bằng cách đọc DbxPKCEManager.java quanh dòng 107 và luồng yêu cầu token trong AuthActivity.java. Tái hiện quy trình đăng nhập OAuth2 PKCE với dropbox-core-sdk 4.0.1 trên Android API 30 bằng cấu hình đã được báo cáo, sau đó xác minh rằng yêu cầu token hoàn tất mà không xảy ra lỗi crash do tham chiếu null.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.