Android 未设置nullToken作用域。此请求没有所需的权限

在使用Autodesk的AndroidDK时，成功获取了令牌；但在创建Bucket时，意外返回“未设置nullToken作用域。此请求没有所需的权限。” 代码：

HttpPost request = new HttpPost(BASEUrl+ upload_srv);
request.addHeader("Content-Type", "application/json");

//v2 changed the param name from 'policy' to 'policyKey'
String jsonstr  ="{\"bucketKey\":\""+ newBucketName + "\", \"servicesAllowed\":{}, \"policyKey\":\"temporary\"}";
HttpEntity jsonent = new StringEntity(jsonstr,HTTP.UTF_8);
request.setEntity(jsonent);

HttpClient httpclient =  getNewHttpClient();
HttpContext localContext = new BasicHttpContext();

localContext.setAttribute(ClientContext.COOKIE_STORE, globalcookies);

HttpResponse response = httpclient.execute(request,localContext);