how Assigning Bookmarks to Folders

hi experts,

I want to assign bookmark to folder by using the followin script  :

Bookmark.assignToFolder(folderId, bookmarkId);

but the book

var id = Bookmark.saveBookmark(INPUT_BOOK.getValue());
Bookmark.assignToFolder("M1X7w0kADoHiAN8AugAAWmMBAoBPIRIAAAA", DDL_LST.getSelectedValue());

but it doesn't work the bookmark is saved in the root

Have you any idea to how fix it

thanks