如何解决 svn中containing working copy admin area is missing问题

1. I use svn --force delete __dir__. That solved the issue for me. Then i continued working with my working copy as normal.
2. svn checkout --force [url] 重新创建被误删除的.svn文件，然后就可以svn delete和svn commit了。
3. I added a directory to svn, then I accidentally deleted the .svn folder within. I used

   svn delete --keep-local folderName