我是 Google 应用引擎连接的 android 项目的新手。当我尝试创建和运行项目时,我得到了以下异常
07-19 07:22:18.437: W/System.err(1854): com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found
07-19 07:22:18.437: W/System.err(1854): Not Found
07-19 07:22:18.447: W/System.err(1854): at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:111)
07-19 07:22:18.447: W/System.err(1854): at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:38)
07-19 07:22:18.447: W/System.err(1854): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:312)
07-19 07:22:18.447: W/System.err(1854): at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1042)
07-19 07:22:18.447: W/System.err(1854): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
07-19 07:22:18.457: W/System.err(1854): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
07-19 07:22:18.457: W/System.err(1854): at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
07-19 07:22:18.457: W/System.err(1854): at com.example.endpointdemoproject.MainActivity$EndpointsTask.doInBackground(MainActivity.java:55)
07-19 07:22:18.457: W/System.err(1854): at com.example.endpointdemoproject.MainActivity$EndpointsTask.doInBackground(MainActivity.java:1)
07-19 07:22:18.457: W/System.err(1854): at android.os.AsyncTask$2.call(AsyncTask.java:287)
07-19 07:22:18.467: W/System.err(1854): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
07-19 07:22:18.467: W/System.err(1854): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
07-19 07:22:18.467: W/System.err(1854): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
07-19 07:22:18.467: W/System.err(1854): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
07-19 07:22:18.477: W/System.err(1854): at java.lang.Thread.run(Thread.java:856)
这是什么错误以及为什么我得到这个。请帮我找到解决方案。