From 1b699c3a2ae2ee43f78cfc793c5e5ba241ad2e2f Mon Sep 17 00:00:00 2001
From: David Maus <dmaus@ictsoc.de>
Date: Sun, 6 Nov 2011 16:19:08 +0100
Subject: [PATCH] Add FAQ entry about `invalid function' errors

---
 org-faq.org | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/org-faq.org b/org-faq.org
index 5ca6632..beda8f1 100644
--- a/org-faq.org
+++ b/org-faq.org
@@ -1278,6 +1278,19 @@ Or use
 
 on a per-file basis.
 
+** After updating Org I get an error about an =invalid function=
+   :PROPERTIES:
+   :CUSTOM_ID: invalid-function-error
+   :END:
+
+In almost all cases an =invalid function= error is caused by an
+unclean Org mode source directory. Cleaning it up and recompiling
+should fix the problem
+
+: cd /path/to/orgmode
+: make clean
+: make
+
 * Faces and highlighting
   :PROPERTIES:
   :CUSTOM_ID: Faces
-- 
2.11.4.GIT