cleverefcross-referencinglistings
\documentclass{scrbook}
\usepackage{listings}
\usepackage{cleveref}
\begin{document}
Ref: \ref{test}.
Cref: \cref{test}.
\begin{lstlisting}
test
\end{lstlisting}
\end{document}
This produces Ref: 1. Cref: ?? 1.. I expected something like Ref: 1. Cref: Listing 1.
I get a LaTeX Warning: \Cref reference format for label type 'lstlisting' undefined on input line 9.
Try with the latest version v0.18.5. The changelog says
Fix listings and algorithm package support, broken by change to local rather than global
\cref@currentlabeldenitions....
From Gonzalo Medina's comment it seems that this solved it, but if it hadn't I'd say you should write to Toby Cubitt, author of cleveref with your MWE. He is very helpful and quite likely to make a bugfix.
The diagnosis by Jean-Sébastien Gosselin is correct: the udesoftec class abuses \AtBeginDocument for typesetting material, which is not a good thing to do, see this answer by Heiko Oberdiek
The problem is that cleveref has to defer several of its tricks at begin document, but these will happen after some material has already been typeset, in particular the list of tables.
Fortunately there is a hook that can be used to transfer the material erroneously executed at begin document to \AfterEndPreamble, as suggested by Heiko. The maintainers of the class should be made aware of the problem.
I also fixed the equation, please look at it: the correct environment to use is multline and several small adjustments are also necessary; the main one is defining an operator for the error function.
\documentclass[en,printlayout]{udesoftec}
\usepackage{etoolbox}
\usepackage{cleveref}
\DeclareMathOperator{\erf}{erf}
%%% the hack!
\def\udesoftecoverride#1\mainmatter{%
\AfterEndPreamble{#1\mainmatter}%
}
%%%
\begin{document}
\frontmatter
\mainmatter
\part{Part1}
\begin{multline}
\label{eq:CDF}
D_{\mathrm{fit}}(x) =
\sum_{i=1}^{N-1}
\frac{1}{2}K_i
\left(1+\erf\Bigl(\frac{x-m_i}{\sqrt{2}\,\sigma_i}\Bigr)\right) \\
+ \frac{1}{2}\biggl(1-\sum_{i=1}^{N-1}K_i\biggr)
\left(1+\erf\Bigl(\frac{x-m_N}{\sqrt{2}\,\sigma_N}\Bigr)\right)
\end{multline}
\part{Part2}
\begin{table}[htbp]
\begin{tabular*}{\hsize}{@{\extracolsep{\stretch{1}}} c c c c }
\hline
\rule{0pt}{3ex} $i$ & $K $& $m$ & $\sigma$ \\
\end{tabular*}
\caption{$i$, $K$, $m$ and $\sigma$ correspond to the parameters in \cref{eq:CDF}}
\label{tab:myTab}
\end{table}
\end{document}
Best Answer
Solution 1
Add the following to your header:
Solution 2
Download the newest version from here (cleveref.dtx and cleveref.ins) and run
latex cleveref.ins.