[O] Error message: "(void-variable org-element-affiliated-keywords)"

[Matt Lundin]

I use flyspell on my org files. With the most recent org-mode from git,
when I switch to an org buffer, I receive the following message:

"Error in post-command-hook (flyspell-post-command-hook): (void-variable 
org-element-affiliated-keywords)"

I have compiled org mode with "make clean && make all".

I notice that there is a defvar in org.el (line 23392):

"(defvar org-element-affiliated-keywords) ; From org-element.el"

Yet it seems this variable is not defined when I open org buffers.

Any advice would be much appreciated.

Best,
Matt