stackmob ios数据存储http 401错误

我正在使用iOS数据存储API将数据上传到StackMob。当我尝试使用用公钥初始化的smclient时，出现此错误

HTTP Code=401 "The operation couldn’t be completed. (HTTP error 401.)" UserInfo=0xa14dac0 {error=Insufficient authorization}

示例代码

[[self.smclient dataStore] createObject:eventDictObj
                                          inSchema:@"EventSchema"
                                         onSuccess:^(NSDictionary *object, NSString *schema)
                                            {
                                                NSLog(@"Created online event : %@", object);
                                                successBlock();
                                            }
                                         onFailure:^(NSError *error, NSDictionary* object, NSString *schema)
                                            {
                                                failedBlock(error);
                                            }];

smclient的初始化如下所示

self.smclient = [[SMClient alloc] initWithAPIVersion:@"0" publicKey:@"xxxxxxxxxx"];

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对于此用例，我不需要使用已登录的用户凭据在StackMob中创建此条目

确保已将权限设置为在stack mob数据库上打开