[Orgmode] schedule/deadline and ido-mode conflict

[David Lee]

Hi everyone,

After insert schedule and deadline by C-c C-s, C-c C-d, I switch buffer 
by ido-mode command ido-switch-buffer.

Emacs will give out a message:
Error in post-command-hook: (void-variable org-ans1)

And ido-switch-buffer doesn't work.

My environment: Emacs 23.1, Org-mode 6.36.

Thanks,
- David