android – FileDownloader: las tareas con el oyente no se pueden iniciar

Uso esta biblioteca , pero cuando presiono el button "actualizar" en mi aplicación, esta biblioteca muestra un error:

W/FileDownloader.FileDownloader: Tasks with the listener can't start, because can't find any task with the provided listener, maybe tasks instance has been started in the past, so they are all are inUsing, if in this case, you can use [BaseDownloadTask#reuse] to reuse theme first then start again: [ru.webant.projects.dossier.activity.MainActivity$7@18e962dd, TRUE] 

Botón onClick "actualizar":

 public void refreshList() { if (isOnline()) { FileDownloader.getImpl().pauseAll(); final RestServiceApi apiService = ServiceGenerator.createService(RestServiceApi.class, getString(R.string.base_url), remindToken()); getContent(apiService); } else { Toast.makeText(MainActivity.this, getString(R.string.no_internet_connection), Toast.LENGTH_SHORT).show(); } } 

getContent (apiService) obtiene la list de files y llama a este método:

 public void saveFilesOnDisk(final List<Folder> folders, final int index) { final List<File> files = folders.get(index).getFiles(); progressBar.setProgress(0); progressBar.setMax(files.size()); String downloaderFile = ""; final FileDownloadListener queueTarget = new FileDownloadSampleListener() { @Override protected void pending(BaseDownloadTask task, int soFarBytes, int totalBytes) { Log.i("status: ", "pending"); super.pending(task, soFarBytes, totalBytes); } @Override protected void progress(BaseDownloadTask task, int soFarBytes, int totalBytes) { Log.i("status: ", "progress"); super.progress(task, soFarBytes, totalBytes); } @Override protected void error(BaseDownloadTask task, Throwable e) { Log.i("status: ", "error"); super.error(task, e); //task.reuse(); //saveFilesOnDisk(folders, 0); } @Override protected void connected(BaseDownloadTask task, String etag, boolean isContinue, int soFarBytes, int totalBytes) { super.connected(task, etag, isContinue, soFarBytes, totalBytes); Log.i("connected file: ", task.getPath()); } @Override protected void paused(BaseDownloadTask task, int soFarBytes, int totalBytes) { Log.i("status: ", "pause"); super.paused(task, soFarBytes, totalBytes); } @Override protected void completed(BaseDownloadTask task) { super.completed(task); Log.i("download: ", "completed; " + homeFolder + java.io.File.separator + task.getPath()); progressBar.setProgress(progressBar.getProgress() + 1); for (int i = 0; i < files.size(); i++) { String filePath = homeFolder + java.io.File.separator + files.get(i).getPath().substring(2); if (filePath.equals(task.getPath())) { adapter.notifyItemChanged(i); } } if (progressBar.getProgress() == files.size() - 1) { if (index < folders.size() - 1) { saveFilesOnDisk(folders, index + 1); } } } @Override protected void warn(BaseDownloadTask task) { Log.i("status: ", "warn"); super.warn(task); } }; for (int i = 0; i < files.size(); i++) { downloaderFile = files.get(i).getPath(); String fullPath = homeFolder + java.io.File.separator + downloaderFile.substring(2); if (!(new java.io.File(fullPath).exists())) { final String url; boolean isDir = false; url = "http://..." + downloaderFile; FileDownloader.getImpl().create(url) .setPath(fullPath, isDir) .setCallbackProgressTimes(300) .setMinIntervalUpdateSpeed(400) .setListener(queueTarget) .asInQueueTask() .enqueue(); } else { progressBar.setProgress(progressBar.getProgress() + 1); if (index == files.size() - 1) { saveFilesOnDisk(folders, index + 1); } } } FileDownloader.getImpl().start(queueTarget, true); } 

cómo manejar este error? Quiero get todos mis files