At Wed, 19 Jan 2011 12:37:57 -0500,
Mehmet Atif Ergun wrote:
>
> Hi,
>
> On opening emacs to take a look at my agenda, emacs opens with the
> following error:
>
> Debugger entered--Lisp error: (void-function ignore-errors)
>   (ignore-errors (org-entry-get nil "ORDERED"))
>
> No other problem but this error message... And everything seems to
> work fine regardless of this message.
> How can I find out what is causing this error on each startup?
>
> I am using Ubuntu 10.10 with emacs 22.2.1. On Arch Linux (with emacs
> 23.2.1), I did not have this problem.

which Org mode version are you using?

M-x org-version RET

I can't find the expression (ignore-errors (org-entry-get nil
"ORDERED")) anywhere in a current Org mode version so I suspect you
use an older one.

The problem is that your Org mode version uses the function
`ignore-errors' which is for some reason not available at run-time.
In Emacs22 this func def is part of the cl package, so it might help
to add a

(require 'cl-macs)

To your init-file so the function is loaded properly.

HTH,
  -- David
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