IllegalStateException while finishFromRedirect in API v3

Thanks for mentioning the method where the issue is coming. And yes it is a Google Cloud project running on AppEngine. I have actually resolved the issue after debugging this getCurrentAccount() method.

And this was the code snippet which we were using for calling getCurrentAccount

String clientIdentifier = "abc/1.0";
String userLocale = Locale.getDefault().toString();
DbxRequestConfig config = new DbxRequestConfig(clientIdentifier, userLocale, AppEngineHttpRequestor.Instance);
DbxClientV2 client = new DbxClientV2(config, accessToken);
client.users().getCurrentAccount().getEmail();

Now I changed this to:

String clientIdentifier = "abc/1.0";
DbxRequestConfig config = new DbxRequestConfig(clientIdentifier);
DbxClientV2 client = new DbxClientV2(config, accessToken);
client.users().getCurrentAccount().getEmail();

And the code started working. Thanks for all the support. One last question, de we need to have this clientIdentifier as "abc/1.0" hardcoded?