eror:DependencySource on same Thread as the DependencyObject

Question

I got that error when i use a background worker.
error - Must create DependencySource on same Thread as the DependencyObject.

code:-

public FileView(string path)

        {

            InitializeComponent();

            loadlist(path);

            listview.ItemsSource = vh.list();

        }
Variableholder vh=new Variableholder();

BackgroundWorker bworker = new BackgroundWorker();

        public void loadlist(string path)

        {

            bworker.WorkerSupportsCancellation = true;

            bworker.WorkerReportsProgress = true;

            bworker.DoWork += bworker_Explorer;

            bworker.ProgressChanged += bworker_AddItem;

            bworker.RunWorkerCompleted += worker_RunWorkerCompleted;

            bworker.RunWorkerAsync(path);

        }

public void bworker_Explorer(object sender,DoWorkEventArgs e)

        {

            ParallelOptions po = new ParallelOptions();

            po.MaxDegreeOfParallelism = 10;

            Parallel.ForEach(e.Argument.ToString().Split(','),po, speratepath =>

            {
              ......
            });

         }

public void bworker_AddItem(object sender,ProgressChangedEventArgs e)

        {

                if (e.UserState != null)

                {

                    vh.list().Add(e.UserState as MusicTags);

                }

        }

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

            .......

        }

private void listview_SelectionChanged(object sender, SelectionChangedEventArgs e)

        {

                        object o = listview.SelectedItem;

                        string filepath = (o as MusicTags).Filepath;

                        itemscontrol.ItemsSource = vh.list().Where(s => s.Filepath == filepath);

        }


  what i do?