title: Having exception committing offset in pubsublite
body: <p>The whole document doesn't give me clear example how to use the API to commit/list offsets</p>
  <p>Here is the code I tried to run</p>
  <pre><code>        CursorServiceClient csc =
              CursorServiceClient.create(
                      CursorServiceSettings.newBuilder().setEndpoint(CursorServiceSettings.getDefaultEndpoint()).build()
              );
      CursorClient cc = new CursorClientImpl(CloudRegion.of(&quot;us-west1&quot;), csc);
      ApiFuture&lt;Map&lt;Partition, Offset&gt;&gt; af = cc.listPartitionCursors(SubscriptionPath.newBuilder()
              .setName(SubscriptionName.of(&quot;TestSubsciption&quot;))
              .setLocation(CloudRegion.of(&quot;us-west1&quot;))
              .setProject(ProjectNumber.of(1111111111l)).build());
      af.get();
  </code></pre>
  <p>It returns an error page
  Error 404 (Not Found)!!1</p>
  <p>The requested URL <code>/google.cloud.pubsublite.v1.CursorService/ListPartitionCursors</code> was not found on this server.  That’s all we know.