Use openfire userService has an error:<error>RequestNotAuthorised</error>

I am using openfire userService plugins to get all users,so I use the url:http://localhost:9090/plugins/userService/userservice. However has an error

The follow is my code:

RequestParams params = new RequestParams();

params.addHeader(“Authorization”, “EuwWSY8W”);

params.addHeader(“Content-Type”, “application/json”);

HttpUtils http = new HttpUtils();

http.configTimeout(10000);

http.send(HttpMethod.GET, “http://localhost:9090/plugins/userService/userservice”, params, new RequestCallBack() {

@Override

public void onSuccess(ResponseInfo responseInfo) {

System.out.println(“result–>”+responseInfo.result);

}

@Override

public void onFailure(HttpException error, String msg) {

System.out.println(“error—>”+error);

System.out.println(“errormsg–>”+msg);

}

});

then I get the message:

result–>RequestNotAuthorised

I had set the userService Enabled and secret key at Admin Console. who can help me please?