Dear Luc, thanks for your explanations.
I updated my code and pushed it to upstream. But it still not working here. Can you give it a try with my code? -- You received this message because you are subscribed to the Google Groups "sphinx-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to sphinx-users+unsubscr...@googlegroups.com. To post to this group, send email to sphinx-users@googlegroups.com. Visit this group at https://groups.google.com/group/sphinx-users. For more options, visit https://groups.google.com/d/optout.