I have a book written in LaTeX (WinEdt 9, Windows 7) that I cannot compile after I switched to a new computer (worked perfectly before). The error is You can't use prefix with "\begingroup on one of the \Newassociation-lines (package answers) in the minimal example below. The problems seems to be an incompatibility between packages, but I have not been able to pinpoint which package(s) that is the problem. In the example below the error is on the line \Newassociation{hint}{Hint}{hint}, but if I remove the \newtheorem-line, the error instead comes on the line \Newassociation{sol}{Solution}{sol}. I cannot get rid of the error by switching the order of the \usepackage commands as was recommended in another discussion here. Any suggestions?

Short text

----more info---- I believe that I am using at least quite recent versions of everything as my computer is less than a year old. I am running: This is pdfTeX, Version 3.1415926-2.5-1.40.14 (MiKTeX 2.9 64-bit) (preloaded format=pdflatex 2015.5.19)

I added \listfiles and used the suggested workaround (otherwise \listfiles would not work; the workaround also worked for the whole book document) and got the following:

*File List*
book.cls    2007/10/19 v1.4h Standard LaTeX document class
bk10.clo    2007/10/19 v1.4h Standard LaTeX file (size option)
siunitx.sty    2015/01/21 v2.6e A comprehensive (SI) units package
expl3.sty    2015/03/01 v5547 L3 programming layer (loader) 
expl3-code.tex    2015/03/01 v5547 L3 programming layer 
etex.sty    1998/03/26 v2.0 eTeX basic definition package (PEB)
l3unicode-data.def    2015/03/01 v5544 L3 Unicode data
l3pdfmode.def    2015/03/01 v5544 L3 Experimental driver: PDF mode
xparse.sty    2014/11/25 v5471 L3 Experimental document command parser
amstext.sty    2000/06/29 v2.01
amsgen.sty    1999/11/30 v2.0
array.sty    2008/09/09 v2.4c Tabular extension package (FMi)
l3keys2e.sty    2014/11/25 v5471 LaTeX2e option processing using LaTeX3 keys
translator.sty    2010/06/12 ver 1.10
keyval.sty    1999/03/16 v1.13 key=value parser (DPC)
answers.sty    2014/08/24 v2.16 Production of solution sheets in LaTeX2e
verbatim.sty    2003/08/22 v1.5q LaTeX2e package for verbatim enhancements
amsthm.sty    2004/08/06 v2.20
graphicx.sty    1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
graphics.sty    2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
trig.sty    1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg    2007/01/18 v1.5 graphics configuration of teTeX/TeXLive
pdftex.def    2011/05/27 v0.06d Graphics/color for pdfTeX
infwarerr.sty    2010/04/08 v1.3 Providing info/warning/error messages (HO)
ltxcmds.sty    2011/11/09 v1.22 LaTeX kernel commands for general use (HO)
epstopdf.sty    2010/02/09 v2.5 Conversion with epstopdf on the fly (HO)
epstopdf-base.sty    2010/02/09 v2.5 Base part for package epstopdf
grfext.sty    2010/08/19 v1.1 Manage graphics extensions (HO)
kvdefinekeys.sty    2011/04/07 v1.3 Define keys (HO)
kvoptions.sty    2011/06/30 v3.11 Key value format for package options (HO)
kvsetkeys.sty    2012/04/25 v1.16 Key value parser (HO)
etexcmds.sty    2011/02/16 v1.5 Avoid name clashes with e-TeX commands (HO)
ifluatex.sty    2010/03/01 v1.3 Provides the ifluatex switch (HO)
pdftexcmds.sty    2011/11/29 v0.20 Utility functions of pdfTeX for LuaTeX (HO)
ifpdf.sty    2011/01/30 v2.3 Provides the ifpdf switch (HO)
caption.sty    2013/05/02 v3.3-89 Customizing captions (AR)
caption3.sty    2013/05/02 v1.6-88 caption3 kernel (AR)
mhchem.sty    2015/04/07 v4.00 for typesetting chemical formulae
l3regex.sty    2014/11/25 v5471 L3 Experimental regular expressions
l3tl-build.sty    2014/08/25 v5378 L3 Experimental token list construction  
l3tl-analysis.sty    2014/05/06 v4745 L3 Experimental token lists analysis
l3str.sty    2014/11/25 v5471 L3 Experimental strings
l3flag.sty    2014/11/25 v5471 L3 Experimental flags
l3str-convert.sty    2014/06/03 v5028 L3 Experimental string encoding conversions
calc.sty    2007/08/22 v4.3 Infix arithmetic (KKT,FJ)
amsmath.sty    2013/01/14 v2.14 AMS math features
amsbsy.sty    1999/11/29 v1.2d
amsopn.sty    1999/12/14 v2.01 operator names
ifthen.sty    2001/05/26 v1.1c Standard LaTeX ifthen package (DPC)
float.sty    2001/11/08 v1.3d Float enhancements (AL)
placeins.sty    2005/04/18  v 2.2
pdfpages.sty    2015/04/15 v0.4w Insert pages of external PDF documents (AM)
eso-pic.sty    2013/10/06 v2.0d eso-pic (RN)
atbegshi.sty    2011/10/05 v1.16 At begin shipout hook (HO)
xcolor.sty    2007/01/21 v2.11 LaTeX color extensions (UK)
color.cfg    2007/01/18 v1.5 color configuration of teTeX/TeXLive
pppdftex.def    2015/04/15 v0.4w Pdfpages driver for pdfTeX (AM)
makeidx.sty    2000/03/29 v1.0m Standard LaTeX package
enumerate.sty    1999/03/05 v3.00 enumerate extensions (DPC)
xspace.sty    2009/10/20 v1.13 Space after command names (DPC,MH)
textgreek.sty    2011/10/09 v0.7 Greek symbols in text
lgrenc.def    2013/12/02 v0.11.2 LGR Greek font encoding definitions
greek-fontenc.def    2014/12/12 v0.12 Common Greek font encoding definitions
lgrcmr.fd    2013/09/01 v1.0 Greek European Computer Regular
siunitx-abbreviations.cfg    2015/01/21 v2.6e siunitx: Abbreviated units

----Correction---- A double \usepackage{caption} removed (still the same error). File list updated (probably did not change).

----Problem solved---- I updated MikTeX and all packages; this solved the problem.

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    Welcome to TeX.SX! This is a cross-post from LC: latex-community.org/forum/…. fixltx2e isn't needed any longer since 2015 format update. And I can compile this without any errors – user31729 Dec 28 '15 at 23:04
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    You should give us more information on the TeX distribution and its version and adding perhaps the output of \listfiles (put that command before \begin{document} – user31729 Dec 28 '15 at 23:08
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    I suspect a non up-to-date TeX distribution. Which one are you using? – egreg Dec 28 '15 at 23:08
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    I have no problem compiling this code. Btw, you don't have to load fixltx2e anymore: the bug fixes are now part of the kernel. – Bernard Dec 28 '15 at 23:09
  • add \listfiles to your preamble and then copy the file list from the log to your question, then someone can tell you which packages are out of date – David Carlisle Dec 28 '15 at 23:19

You are hitting an obscure bug in LaTeX prior to the 2015 kernel. I suspect the “new” machine has a non updated TeX distribution.

The best thing you can do is to ensure that the TeX distribution is the most recent one, with all updates in place.

There is a workaround, anyway: just define a new counter before the error happens.

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