'Missing $ inserted' error after adding Slovak language

Question

I am creating derivative work of classic thesis template from Andre Miede (http://www.miede.de/index.php?page=classicthesis). What I have done was adding option for slovak language into the document class like this:

\documentclass[twoside,openright,titlepage,numbers=noenddot,headinclude,%1headlines,% letterpaper a4paper
        footinclude=true,cleardoublepage=empty,abstractoff, % <--- obsolete, remove (todo)
        BCOR=5mm,paper=a4,fontsize=11pt,%11pt,a4paper,%
        ngerman,american,slovak%
        ]{scrreprt}

This is excerpt of error message I get when trying to compile the source file:

Package natbib Warning: Citation `knuth:1974' on page xi undefined on input lin
e 11.


Package natbib Warning: Citation `knuth:1974' on page xi undefined on input lin
e 11.

("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\eulervm\uzeur.fd")
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\microtype\mt-eur.cfg")
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\eulervm\uzeus.fd")
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\microtype\mt-eus.cfg")
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\eulervm\uzeuex.fd")
("C:\Program Files (x86)\MiKTeX 2.9\tex\latex\psnfss\ot1zplm.fd")
Overfull \hbox (2.84056pt too wide) in paragraph at lines 27--36
[]\T1/pplj/m/n/10.95 Regarding the ty-pog-raphy and ot-her help, many thanks go
 to Marco
) [11] [12] (FrontBackmatter/Contents.tex (ChinesePoets.toc) [13]
(ChinesePoets.lof) (ChinesePoets.lot) (ChinesePoets.lol) [14]) [1] [2]
(Chapters/Chapter01.tex
Kapitola 1.
! Missing $ inserted.
<inserted text> 
                $
l.7     Master'
               s
? 

This is relevant part of source file Chapter01.tex:

\begin{enumerate}
    \item Provide students with an easy-to-use template for their
    Master's
    or PhD thesis. (Though it might also be used by other types of
    authors
    for reports, books, etc.)
    \item Provide a classic, high-quality typographic style that is
    inspired by \citeauthor{bringhurst:2002}'s ``\emph{The Elements of
    Typographic Style}'' \citep{bringhurst:2002}.
    \marginpar{\myTitle \myVersion}
\end{enumerate}

It seems like the LaTex compiler has problem with apostrophe character '. Why is this happening ? Please explain it in simple way because most of my life I have used tools like Word and OpenOffice Writer. I have minimal experiences with TeX systems. Just recently finished reading introductory book into LaTeX system.

P.S. The problem can be reproduced on this simple document:

\documentclass[ twoside,openright,titlepage,numbers=noenddot,headinclude,%1headlines,% letterpaper a4paper
                footinclude=true,cleardoublepage=empty,abstractoff, % <--- obsolete, remove (todo)
                BCOR=5mm,paper=a4,fontsize=11pt,%11pt,a4paper,%
                ngerman,american,slovak%
                ]{scrreprt}

%********************************************************************
% Note: Make all your adjustments in here
%*******************************************************
\input{classicthesis-config}

%********************************************************************
% Hyphenation
%*******************************************************
%\hyphenation{put special hyphenation here}

% ********************************************************************
% GO!GO!GO! MOVE IT!
%*******************************************************
\begin{document}
\frenchspacing
\raggedbottom
%\renewcommand*{\bibname}{new name}
%\setbibpreamble{}
\pagenumbering{roman}
\pagestyle{plain}
%********************************************************************
% Frontmatter
%*******************************************************

%************************************************
\chapter{Introduction}\label{ch:introduction}
%************************************************
This bundle for \LaTeX\ has two goals:
\begin{enumerate}
    \item Provide students with an easy-to-use template for their
    Master's
    or PhD thesis. (Though it might also be used by other types of
    authors
    for reports, books, etc.)
    \item Provide a classic, high-quality typographic style that is
    inspired by \citeauthor{bringhurst:2002}'s ``\emph{The Elements of
    Typographic Style}'' \citep{bringhurst:2002}.
    \marginpar{\myTitle \myVersion}
\end{enumerate}
\end{document}

Answer 1

Classicthesis does a mess, so does the config-file that is provided with the template bundlle. Simple advice, don't use it.

Simple solution to the stated problem is to load package classicthesis before loading the config file.

After reducing everything that is irrelevant for the stated problem, we come to the following.

\documentclass[slovak]{scrreprt}
\usepackage{babel}
\usepackage{eulervm}
\begin{document}
Master's
\end{document}

The slovak-option of babel seems to do strange stuff.
Load babel after setting the font, and everything is fine.