title: Android Mobile Backend Starter fail with 404 not found... some times
body: <p>Last afternoon I created a project and deployed the mobile backend started. I edited the client code and sucessfully did some data insertion.</p>
  
  <p>Some time (hours) after, I changed the cliend code again and the insertion failed with the error: </p>
  
  <pre><code>com.google.api.client.googleapis.json.GoogleJsonResponseException: 404 Not Found
  </code></pre>
  
  <p>As I didn't did any substantial change in the code I concluded that the error was on the app engine side so I redeployed the project and that solved the problem. The insertions came through again.</p>
  
  <p>This morning I was back with the 404 error. This time redeploying didn't work.</p>
  
  <p>The error log I get in the app engine is:</p>
  
  <pre><code>Uncaught exception from servlet
  javax.servlet.UnavailableException: com.google.api.server.spi.config.ApiConfigException: &lt;Entity [GoogleCloudEndpointConfiguration("EndpointV1")]:
      clientIds = null
      audiences = null
  &gt;
  .audiences was not of type String or List&lt;String&gt;.
      at org.mortbay.jetty.servlet.ServletHolder.makeUnavailable(ServletHolder.java:415)
      at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:451)
      at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
      at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
      at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:57)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
      at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
      at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at org.mortbay.jetty.Server.handle(Server.java:326)
      at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
      at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
      at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
      at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:439)
      at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:480)
      at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:487)
      at com.google.tracing.TraceContext.runInContext(TraceContext.java:774)
      at com.google.tracing.TraceContext$DoInTraceContext.runInContext(TraceContext.java:751)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:342)
      at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:334)
      at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:484)
      at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
      at java.lang.Thread.run(Thread.java:722)
  </code></pre>
  
  <p>Any idea what is happening and what can I do to solve it?</p>