javascript - cordova file taken by camera moveTo persistent folder - failure -

i have problem copy photo temp directory persistent directory in cordova. code looks this:

$(document).on("click","#btn_bild_aufnehmen",function(){     var options = {       destinationtype: camera.destinationtype.file_uri,       sourcetype: camera.picturesourcetype.camera,     };      navigator.camera.getpicture(function(imageuri){                     window.requestfilesystem(localfilesystem.persistent, 0, function(filesys) {             alert("folder create");              //the folder created if doesn't exist             filesys.root.getdirectory( "appname/bildaufnahme",                 {create:true, exclusive: false},                 function(directory) {                     alert("move file..");                     imageuri.moveto(directory, "example.png",function(){                         alert("show image");                         $(".div_objektbild").css("background-image","url("+bildaufnahme_dir+"example.png)");                     },function(error){                         alert('code: '    + error.code    + '\n' +                             'message: ' + error.message + '\n');                     });                     console.log("release");                  },                 function(error){                     alert('code: '    + error.code    + '\n' +                         'message: ' + error.message + '\n');                 });         },         function(error){             alert('code: '    + error.code    + '\n' +                 'message: ' + error.message + '\n');         }); 

all alerts reached, except line alert("show image");. error callback of moveto function not called either. guess there wrong moveto-function. has suggestion wrong?