From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vladimir Alexiev <vladimir@sirma.bg>
Subject: Re: [BUG] org-babel-tangle causes "Wrong type argument:	sequencep,
 hline"
Date: Sun, 27 Feb 2011 23:21:55 +0000 (UTC)
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To: emacs-orgmode@gnu.org

> The hline was assumed to be a list (as normal rows are) by the indexing
> code, so I just inserted a quick check to ensure that hlines are left
> alone.

So Eric, you're handing this arg as per documentation (info)
* :hlines: `no' (default)
  Strips horizontal lines from the input table.

But you've missed handling this arg:
* :colnames `nil' (default) 
  If an input table looks like it has column names (because
  its second row is an hline), then the column names will be removed
  from the table before processing

I think that org-babel-ref-index-list should receive the stripped table,
i.e. these elements should have been removed:
  ("search" "replace") hline

I think the fix is somewhere in org-babel-disassemble-tables, 
not in functions it calls (downstream from it). 
But in my debugging it always returned (nil nil nil)?