how can i solve this problem! About PC SDK!!!

 private void button6_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.Filter = "Mod Files (.mod)|*.mod|All Files (*.*)|*.*";
            openFileDialog1.FilterIndex = 1;

            openFileDialog1.Multiselect = true;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                FileSystem aFileSystem = controller.FileSystem;
                string remoteDir = controller.FileSystem.RemoteDirectory;
                controller.FileSystem.PutFile("d:\downmod\", remoteDir);
                try
               {
                  //  tasks.LoadProgramFromFile(aPrgFileName, RapidLoadMode.Replace);
                   tasks.LoadModuleFromFile("move.mod", RapidLoadMode.Add);
               }
               catch (ArgumentException ex)
               {
                    return;
                }