I have been using the following code block to generate a sitemap for my org-jkyll based blog.

#+begin_src emacs-lisp :results output silent :exports none :cache yes
  (org-publish-sitemap
   (assoc "indblog" org-publish-project-alist)
   "sitemap.org")
#+end_src

I had not generated the sitemap for a while, and now I find that it ends with the following message, and sitemap.org <http://sitemap.org/> is not recreated.

----
Generating sitemap for Sitemap for www.indianstatistics.org
org-publish-cache-get: ‘org-publish-cache-get’ called, but no cache present
——

Any pointers?

Vikas

Org version: Org mode version 9.1.4 (release_9.1.4-218-g993f76 @ /Users/vikas/.emacs.d/personal/org-mode/lisp/)
Emacs: GNU Emacs 25.3.1 (x86_64-apple-darwin16.3.0, Carbon Version 157 AppKit 1504.76) of 2017-09-30