获取的token无效

代码如下：
OAuth oauth = OAuthFactory.create(OAuthType.SELF, new OAuthContext(clientId, client_secret, kdt_id));
                System.out.println(JsonUtils.toJson(oauth.getToken()));
                Itoken = JsonUtils.toJson(oauth.getToken());
YZClient client = new DefaultYZClient(new Token(Itoken));
                        YouzanTradesSoldGetParams youzanTradesSoldGetParams = new YouzanTradesSoldGetParams();
token能正常获取到但是提示token无效：
{"access_token":"e81b9c012806384fa645de506efe9f6a","refresh_token":null,"expires_in":604800,"scope":"storage points reviews multi_store salesman pay_qrcode item user trade_advanced trade item_category logistics coupon_advanced shop coupon crm_advanced trade_virtual","token_type":null}
Exception in thread "main" com.youzan.open.sdk.exception.KDTException: ErrorResponse{code='40010', msg='参数 token 无效'}

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