Connection-to-server-unsuccessful-phonegap-android-emulator

Question

connection-to-server-unsuccessful-phonegap-android-emulator error during lunch, I think code js is old but phonegap is new from github this wk... any comment? just replaced index.html from a finished book chapter in phonegap 2011-2 (c)...
<script type="text/javascript">
          var filename = "read-write.txt";
            var filePath = "file:///sdcard/read-write.txt";
                              var textarea = document.getElementById("textarea");
            /** Called when phonegap javascript is loaded */
            function onDeviceReady(){
                var readButton = document.getElementById("read");
                var writeButton = document.getElementById("write");
                readButton.addEventListener("click", readFile, false);
                writeButton.addEventListener("click", saveFile, false);
            function readFile(){
                window.resolveLocalFileSystemURI(    //filename to be read
                filePath,    //success callback
                function(fileEntry){
                          fileEntry.file(
                                                            function(file){
                                                                      var fileReader = new FileReader();
                                              fileReader.onloadend = function(evt){
                                                  document.getElementById("textarea").value = evt.target.result;
                                              fileReader.readAsText(file);
                                                            function(error){
                                                                      alert("Got error while reading "+filePath);
                },    //error callback
                function(error){
                    alert(filename + " not present, please add content and click Save first");
            function saveFile(){
                window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem){
                                                  alert(fileSystem.name);
                    var sdcardEntry = fileSystem.root;
                                                  sdcardEntry.getFile(
                                                            filename,
                                                            {create:true},
                                                            function(fileEntry){
                                                                      fileEntry.createWriter(
                                                                                function(fileWriter){
                                                                                           fileWriter.onwrite = function(evt) {
                                                                                                  alert("Write was successful!");
                                                                                                    document.getElementById("textarea").value="";
                                                                                           fileWriter.write(document.getElementById("textarea").value);
                                                                                function(error){
                                                                                          alert("Failed to get a file writer for "+filename);
                                                            function(error){
                                                                      alert("Got error while reading "+filename+" "+error);
                }, function(error){
                    alert("Got Error while gaining access to file system");
            /** Called when browser load this page*/
            function init(){
                document.addEventListener("deviceready", onDeviceReady, false);
        </script>

Answer 1

I FIXED PROBLEM WAS A FILE WITH SPACES IN filename...
well after i got error here in WRITE (BUTTON PRESS) TO FILE FUNCTION of textarea text...
function(error){
alert("Got error while reading "+filename+" "+error);
well?