为什么我从Java Spotify-Api获得“401 Unauthorized”响应？

Question

我正在尝试学习spotify api。我已经从https://developer.spotify.com/创建了一个应用，并获取了 客户ID 和 客户端密钥

现在我要做的是获取我的个人资料的属性。我查看了此处https://github.com/thelinmichael/spotify-web-api-java的代码示例，并输入了下面显示的代码

public static void main(String[] args) {
    final String clientId = "My Client ID";
    final String clientSecret = "My Client Secret";
    Api api = Api.builder().clientId(clientId).clientSecret(clientSecret).build();


    /* Create a request object. */
    final ClientCredentialsGrantRequest request = api.clientCredentialsGrant().build();

    /* Use the request object to make the request, either asynchronously (getAsync) or synchronously (get) */
    final SettableFuture<ClientCredentials> responseFuture = request.getAsync();

    /* Add callbacks to handle success and failure */
    Futures.addCallback(responseFuture, new FutureCallback<ClientCredentials>() {
      @Override
      public void onSuccess(ClientCredentials clientCredentials) {
        /* The tokens were retrieved successfully! */
        System.out.println("Successfully retrieved an access token! " + clientCredentials.getAccessToken());
        System.out.println("The access token expires in " + clientCredentials.getExpiresIn() + " seconds");

        /* Set access token on the Api object so that it's used going forward */
        api.setAccessToken(clientCredentials.getAccessToken());
        /* Please note that this flow does not return a refresh token.
       * That's only for the Authorization code flow */
      }

      @Override
      public void onFailure(Throwable throwable) {
        /* An error occurred while getting the access token. This is probably caused by the client id or
         * client secret is invalid. */
          throwable.printStackTrace();
      }
    });

    final CurrentUserRequest currentUserRequest = api.getMe().build();

    try {
        final User user = currentUserRequest.get();

        System.out.println("Display name: " + user.getDisplayName());
    } catch (Exception e) {
        System.out.println("Something went wrong! " + e.getMessage());
        e.printStackTrace();
    }
}

我正在成功检索访问令牌，但当我尝试获取当前用户时出现问题。这是代码的输出：

Successfully retrieved an access token! [my access token]
The access token expires in 3600 seconds
Something went wrong! 401
com.wrapper.spotify.exceptions.BadRequestException: 401
    at com.wrapper.spotify.SpotifyHttpManager.handleErrorStatusCode(SpotifyHttpManager.java:178)
    at com.wrapper.spotify.SpotifyHttpManager.execute(SpotifyHttpManager.java:157)
    at com.wrapper.spotify.SpotifyHttpManager.get(SpotifyHttpManager.java:53)
    at com.wrapper.spotify.methods.AbstractRequest.getJson(AbstractRequest.java:34)
    at com.wrapper.spotify.methods.CurrentUserRequest.get(CurrentUserRequest.java:32)
    at com.kadir.spotify.Main.main(Main.java:52)

我在这里缺少什么？提前谢谢。