com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String org.rz.client.GreetingService.rr() throws java.lang.IllegalArgumentException' threw an unexpected exception: net.sf.json.JSONException: JSONObject["error"] is not a JSONObject.

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Service method 'public abstract java.lang.String org.rz.client.GreetingService.rr() throws java.lang.IllegalArgumentException' threw an unexpected exception: net.sf.json.JSONException: JSONObject["error"] is not a JSONObject.
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com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.String org.rz.client.GreetingService.rr() throws java.lang.IllegalArgumentException' threw an unexpected exception: net.sf.json.JSONException: JSONObject["error"] is not a JSONObject.	at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:415)	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:605)	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:333)	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:303)	at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:373)	at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:68)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:370)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)	at java.lang.Thread.run(Thread.java:745)Caused by: net.sf.json.JSONException: JSONObject["error"] is not a JSONObject.	at net.sf.json.JSONObject.getJSONObject(JSONObject.java:2163)	at com.fourspaces.couchdb.CouchResponse.<init>(CouchResponse.java:90)	at com.fourspaces.couchdb.Session.http(Session.java:365)	at com.fourspaces.couchdb.Session.get(Session.java:325)	at com.fourspaces.couchdb.Session.getDatabase(Session.java:183)	at org.rz.server.GreetingServiceImpl.rr(GreetingServiceImpl.java:21)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:587)	... 31 more