iOS上的Dropbox数据存储API内部错误：断言失败

我正在尝试从任何视图控制器全局设置数据存储观察器

我这样调用该方法：

//SomeViewController.m
- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];

  [[PPDropboxSync sharedDropboxSync] listenForDropboxChangesInController:self];
}

//PPDropboxSync.m
-(void)listenForDropboxChangesInController:(id)controller
{
  if([self isDropboxLinked]){
    //Get the dropbox datastore session
    [self openDatastore];

    __weak typeof(controller) weakController = controller;
    __weak DBDatastore *weakStore = self.store;

    [weakStore addObserver:weakController block:^(){

      if(weakStore.status & DBDatastoreIncoming){
        //The sync returns a dictionary of affected tables, each with a collection of changed records
        NSDictionary *changes = [weakStore sync:nil];

        //Process changes...

      }
      //Update sync time
      [self updateSyncTime];
    }];        
  }
}

…它的执行方式如下：

//SomeViewController.m
- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];

  [[PPDropboxSync sharedDropboxSync] listenForDropboxChangesInController:self];
}

//PPDropboxSync.m
-(void)listenForDropboxChangesInController:(id)controller
{
  if([self isDropboxLinked]){
    //Get the dropbox datastore session
    [self openDatastore];

    __weak typeof(controller) weakController = controller;
    __weak DBDatastore *weakStore = self.store;

    [weakStore addObserver:weakController block:^(){

      if(weakStore.status & DBDatastoreIncoming){
        //The sync returns a dictionary of affected tables, each with a collection of changed records
        NSDictionary *changes = [weakStore sync:nil];

        //Process changes...

      }
      //Update sync time
      [self updateSyncTime];
    }];        
  }
}

我在这一行遇到一个错误：

NSDictionary*changes=[weakStore sync:nil]

…也就是说：

[ERROR]ERR:DROPBOX\u ERROR\u INTERNAL:database.cpp:317:database.cpp:317:assert失败：记录
断言失败：（！“记录”），函数应用更改，文件/ws/syncsdk/common/ssync/database.cpp，第317行

有什么想法吗？
这看起来像个bug。你能用你的应用程序ID、用户ID和复制步骤打开票据吗？提前谢谢！对于同样看到此问题的任何人，请升级到最新版本，当前为3.0.2：