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Have included the following in my style file

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{andromeda}[2022/10/03 Andromeda Package]

\newif\ifCountryMaps
\CountryMapsfalse

\newif\ifScienTech
\ScienTechfalse

%% Options set boolean flags to true
\DeclareOption{CountryMaps}{\CountryMapstrue}
\DeclareOption{ScienTech}{\ScienTechtrue}

%% process the options before checking if the booleans are true
\ProcessOptions

%% Load Country Maps
\ifCountryMaps
  \RequirePackage{countriesofeurope}
\fi

%% Load Science and Technology Packages
\ifScienTech
  \RequirePackage{gensymb}
  \RequirePackage{wasysym}
  \RequirePackage{ifsym}
  \RequirePackage{textcomp}
  \RequirePackage{steinmetz}
  \RequirePackage{emf}
  \RequirePackage{fontawesome}
  \RequirePackage{utfsym}
  \RequirePackage{keystroke}
  \RequirePackage{svrsymbols}
\fi

\RequirePackage{etoolbox} % Programming tools

%% Deferred colours (with asterisk) for dvipsnames
\RequirePackage[dvipsnames*,svgnames,x11names]{xcolor}
\definecolors{Lavender}

%% Bold typeface
\renewcommand{\seriesdefault}{\bfdefault}
\boldmath

And getting

! LaTeX Error: Option clash for package xcolor.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.110 \definecolors
                 {Lavender}
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5
  • 1
    learn to make a complete example.
    – Ulrike Fischer
    Oct 3, 2022 at 22:11
  • Some other package you load before doing \usepackage[...]{xcolor} already loads xcolor with different options.
    – egreg
    Oct 3, 2022 at 22:38
  • If I have \usepackage[CountryMaps]{andromeda} followed by \usepackage{userndr} and userndr has \usepackage{andromeda}. Would that be a problem?
    – Veak
    Oct 3, 2022 at 22:45
  • I introspected a bit more and a problem seems to occur with this command \newcommand{\teo-teora-pigment}{RawSienna}.
    – Veak
    Oct 3, 2022 at 22:57
  • @konmi no you have already loaded xcolor as egreg said above so you get an error from \RequrePackage I
    – David Carlisle
    Oct 3, 2022 at 23:02

1 Answer 1

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You provided no test file but

\documentclass{article}
\usepackage[ScienTech]{andromeda}
\begin{document}

\end{document}

shows in the log:

 (/usr/local/texlive/2022/texmf-dist/tex/latex/utfsym/utfsym.sty
Package: utfsym 2022/04/17 Use TikZ to support icons from Unicode blocks

(/usr/local/texlive/2022/texmf-dist/tex/latex/l3packages/l3keys2e/l3keys2e.sty
(/usr/local/texlive/2022/texmf-dist/tex/latex/l3kernel/expl3.sty
Package: expl3 2022-09-28 L3 programming layer (loader) 

(/usr/local/texlive/2022/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def
File: l3backend-pdftex.def 2022-09-28 L3 backend support: PDF output (pdfTeX)
\l__color_backend_stack_int=\count198
\l__pdf_internal_box=\box52
))
Package: l3keys2e 2022-06-22 LaTeX2e option processing using LaTeX3 keys
) (/usr/local/texlive/2022/texmf-dist/tex/latex/xcolor/xcolor.sty

showing xcolor is already loaded (with no options) via utfym.sty

So you get an option clash from

\RequirePackage[dvipsnames*,svgnames,x11names]{xcolor}

You could load xcolor with options earlier, or better load fewer potentially clashing packages,

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