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I am using a report document classe. I have an abstract and an acknowledgement sections before the toc.

This is my definition for Acknowledgements. I took it from someplace in the web, so there might be errors.

        \bfseries \ackname
          {\bfseries \ackname\vspace{-.5em}\vspace{\z@}}%

Every time I compile my file I get the following:

(../abstract/abstract.tex)pdfTeX warning (ext4): destination with the same identifier (name{page.a}) has been already used, duplicate ignored
[1]) (../ack/root.texpdfTeX warning (ext4): destination with the same identifier (name{page.a}) has been already used, duplicate ignored

My guess is that its trying to typeset these two pages to the same page as the title page.

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I am still having problems with this. Now I need two abstracts and I've noticed that the Abstract environment forces the page number reset. – Tiago Veloso Dec 20 '10 at 15:58
up vote 4 down vote accepted

hyperref creates page anchors. Since you've got 2 pages with the same number, even if it might not be printed, you would get two anchors with the same name. If no page anchors are needed, pageanchor=false removed the anchors and the warning.

But if they are required, for instance for the index, you need another fix. One could switch it off and on:


Or check the definition of acknowledgements: what's the reason why you use the titlepage environment? This sets the page number (again) to 1. You could do it in another way, for example use \thispagestyle{empty} instead if your reason is to have a page without visible page number.

Further there are hyperref options for avoiding such problems: pdfpagelabels and plainpages=false are useful if page numbers repeat, though they don't help if \thepage is repeated. Have a look at Hyperref and repeated page numbers in the UK TeX FAQ.

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A small correction in the \else branch should do the trick.


In your version you have still \abstractname in this line.

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Thanks for noticing. I fixed it, but it still gives me the warnings. – Tiago Veloso Dec 17 '10 at 8:57

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