搜索部门时，报错：user access token is empty

代码如下：
public static DepartmentSearchResult searchDepartments(String query) throws Exception { ContactService contactService = new ContactService(config); DepartmentSearchReqBody searchReqBody = new DepartmentSearchReqBody(); searchReqBody.setQuery(query); Response<DepartmentSearchResult> response = contactService.getDepartments().search(searchReqBody).execute(); System.out.println(Jsons.DEFAULT_GSON.toJson(response)); if (response.getCode() == 0) { return response.getData(); } return null; }
已经执行过testAccessToken方法。
执行searchDepartments报错：user access token is empty

Start with the provided searchDepartments example and compare its ContactService configuration with the testAccessToken setup. Trace the departments search request to find where the user access token is read and reproduce the empty-token error. Done means the cause is identified and the department search no longer fails when valid authentication is configured.