The function delete-directory attempts to delete the directory directory . It returns t on success, and on failure either returns nil or signals an error.
error determines what happens when delete-directory fails. When error is nil (the default), if directory does not exist delete-directory returns nil , otherwise any failure causes an error to be signaled. If error is :no-error , delete-directory returns nil on any failure. If error is :error , any failure causes an error to be signaled.
Typical reasons for failures in delete-directory are that directory is not empty, or that the user does not have the right permissions.