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The package hyperref produces this error when it doesn't know how to make something into a “character” that will go into one of its PDF entries. For example, the (unlikely) sequence <!– {% raw %} –
>
\newcommand{\filled}[2]{% #1% \hfil #2% } \section{\filled{foo}{bar}}
<
!– {% endraw %} –
>
p
rovokes the error. Hyperref goes on to tell you:
removing `\hfil' on input line ...
It's not surprising: how would you put the
typesetting instruction \hfil into a PDF bookmark?
Hyperref allows you to define an alternative for such
things: the command \texorpdfstring, which takes two
arguments - the first is what is typeset, the second is what is put
into the bookmark. For example, what you would probably like in this
case is just a single space in the bookmark; if so, the erroneous
example above would become:
<!– {% raw %} –
>
\newcommand{\filled}[2]{% #1% \texorpdfstring{\hfil}{\space}% #2% } \section{\filled{foo}{bar}}
<
!– {% endraw %} –
>
a
nd with that definition, the example will compile succesfully
(hyperref knows about the macro \space).