IEEEtran and pdfpages

Question

I'm not able to make even this minimal piece of code work when trying to include a pdf file in an IEEEtran document:

\documentclass{IEEEtran}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}

\usepackage{pdfpages}

\begin{document}
\includepdf[pages=-]{file.pdf}
\end{document}

What I get is the following error:

! Undefined control sequence.
\@outputdblcol ...}}\@combinedblfloats \@setmarks
\@outputpage \begingroup \...

If I try to replace the document class with a standard one instead (e.g. article) the PDF file is produced with no errors.

Can you help me figure out what I'm doing wrong?

Thank you in advance

Answer 1

This issue seems to be caused by calling \includepdf right after \begin{document}. You can either add some text, or use \null to put 'something' without any effect before including your pdf:

\documentclass{IEEEtran}
    \usepackage[T1]{fontenc}
    \usepackage[utf8]{inputenc}
    \usepackage[english]{babel}
    \usepackage{pdfpages}

\begin{document}
    \null%
    \includepdf[pages=-]{file.pdf}
\end{document}

Answer 2

It seems to work if you define the offending command if it isn't already defined:

\documentclass{IEEEtran}

\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}

\usepackage{pdfpages}
\makeatletter
\@ifundefined{@setmarks}{\let\@setmarks\relax}{}
\makeatother
\begin{document}
\includepdf[pages=-]{file.pdf}
\end{document}