I have a problem with the acro-package and have not been able to find any answer or even anyone with the same problem. I am writing my thesis and since it is an area with a lot of abbreviations it is customary to have a list of abbreviations in the thesis. But when I use the acro-package everything except the writing of the list(e.g using \ac{some abbreviation} in the text). I have made a short test file just to make sure that it really is just the \printacronyms-command that does not work. The code is:

    short = UDP,
    long = User Datagram Protocol
testing if it is possible to print out the abbrivitions, e.g \ac{udp}

I get Three errors, namely:

!undefined Control sequence.\acro_sort_prop:NN...rop{##1}{##2}\seq_sort:Nn\I__acro_tmpa_seq{\int_co...
!Undefined Control sequence.<argument>\LaTeX3error:A sequence was misused.
!Undefined Control sequence.<argument>\sort_return_same:

I'm using TexMaker with pdfLaTeX. Tried to do it on a friends computer and it worked. Would rather see a solution where I don't need to use a different package or install some different software (e.g TexStudio..) since I've already produced quite a lot of text and I use the \ac{}-command a lot. I will be very grateful if somebody can help me. Thanks in advance!

closed as off-topic by moewe, gernot, CarLaTeX, Mico, Torbjørn T. Mar 30 '17 at 9:34

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  • 1
    I could run your MWE without a problem. Maybe your packages are outdated. I have acro.sty 2017/01/22 v2.7a and expl3-code.tex 2017/03/18 v7019. Update your packages either via tlmgr (TeX live) or 'MikTeX Update' (MikTeX - in admin and user mode). – moewe Mar 29 '17 at 14:31
  • 1
    It could indeed be an update problem, like moewe says. The acro package has been updated on a frequent basis in the last few months (which is a good thing, as it's actively being developed). – thymaro Mar 29 '17 at 23:59
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    Thank you @moewe, after some updating it now works. Unfortunately i don't know which package actually caused the problem because the acro-package was up to date but the MikTex updater found a lot of packages that needed updating... :) – lillpelle Mar 30 '17 at 7:56
  • I suspect it was some LaTeX3 related package such as expl3 or xparse, but we can't be sure now. – moewe Mar 30 '17 at 8:01
  • 4
    I'm voting to close this question as off-topic because the problem was solved by updating the packages involved. – moewe Mar 30 '17 at 8:02

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