@Nullable
  public ValidationInfo validate(@NotNull FindModel model) {
    VirtualFile directory = FindInProjectUtil.getDirectory(model);
    if (directory == null) {
      return new ValidationInfo(FindBundle.message("find.directory.not.found.error"), myDirectoryComboBox);
    }
    return null;
  }
@Nullable
  public ValidationInfo validate(@NotNull FindModel model)