# How do I get rid of “Key http://link is undefined” warnings? [closed]

When using the hyperref package, I keep getting this warning that says something like:

Key ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf is undefined


whenever I include an http link.

For example:

\documentclass{article}

\begin{document}

Here is a link to \href{ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf}{The Short
Math Guide}

\end{document}


I'm using pdflatex.exe to generate the output, and v6.82h of hyperref.sty.

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## closed as too localized by Joseph Wright♦Oct 19 '11 at 9:36

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Your example document works fine for me. Is that the full error message you get? What version of hyperref are you using? –  Jake Aug 25 '11 at 0:49
I am using the MikTeX distribution, with TeXlipse as a front end –  bobobobo Aug 25 '11 at 0:49
The full warning text is Key ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf is undefined document.tex line 7 Problem –  bobobobo Aug 25 '11 at 0:50
Could you include \listfiles in your preamble and look for the hyperref.sty version number near the end of your .log file? –  Jake Aug 25 '11 at 0:55
Your example works fine. But I can get an error ! Package keyval Error: ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf undefined.  if I use angle brackets \href[..]{...} instead of correct braces: \href{..}{...}. So my guess is you didn't check your example but only believe that it demonstrates your real problem. –  Ulrike Fischer Aug 25 '11 at 6:51