Fix cleveref ?? prefix with floatrow

Question

I am following the solution in this answer to add captions and cross-references to code chunks in an .Rmd file.

I would like to use cleveref to refer to these code chunks. However, currently my \cref's are being prefixed by ??. How can I fix my code to prevent this?

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MWE

\documentclass{report}

\usepackage{color}
\usepackage{cleveref}
\usepackage{floatrow}
\usepackage{caption}
\usepackage{framed}
\usepackage{fancyvrb}


% Extra bits for context
\newenvironment{Shaded}{\begin{snugshade}}{\end{snugshade}}
\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\{\}}
\definecolor{shadecolor}{RGB}{248,248,248}
\newcommand{\DecValTok}[1]{\textcolor[rgb]{0.00,0.00,0.81}{#1}}
\newcommand{\NormalTok}[1]{#1}
\newcommand{\StringTok}[1]{\textcolor[rgb]{0.31,0.60,0.02}{#1}}


% Make a new chunk float to attach label and caption to
\DeclareNewFloatType{chunk}{placement=H, fileext=chk, name=}
\captionsetup{options=chunk}
\renewcommand{\thechunk}{Chunk~\thesection.\arabic{chunk}}
\makeatletter
\@addtoreset{chunk}{chapter}
\makeatother


\begin{document}

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{## Assign the value 5 to x}
\NormalTok{x =}\StringTok{ }\DecValTok{5}
\NormalTok{x}
\end{Highlighting}
\end{Shaded}

\captionof{chunk}{This is an example of a code caption.}\label{chk:example}

In \cref{chk:example} we do computering.

\end{document}

Answer 1

You have to declare \crefname & \Crefname. I took the opportunity to simplify a bit your code.

 \documentclass{report}

\usepackage{color}
\usepackage{cleveref}
\usepackage{floatrow}
\usepackage{caption}
\usepackage{framed}
\usepackage{fancyvrb}


% Extra bits for context
\newenvironment{Shaded}{\begin{snugshade}}{\end{snugshade}}
\DefineVerbatimEnvironment{Highlighting}{Verbatim}{commandchars=\\\{\}}
\definecolor{shadecolor}{RGB}{248,248,248}
\newcommand{\DecValTok}[1]{\textcolor[rgb]{0.00,0.00,0.81}{#1}}
\newcommand{\NormalTok}[1]{#1}
\newcommand{\StringTok}[1]{\textcolor[rgb]{0.31,0.60,0.02}{#1}}

% Make a new chunk float to attach label and caption to
\DeclareNewFloatType{chunk}{placement=H, fileext=chk, within=section, name=Chunk}
\crefname{chunk}{chunk}{chunks}
\Crefname{chunk}{Chunk}{Chunks}

\begin{document}

\begin{Shaded}
\begin{Highlighting}[]
\NormalTok{## Assign the value 5 to x}
\NormalTok{x =}\StringTok{ }\DecValTok{5}
\NormalTok{x}
\end{Highlighting}
\end{Shaded}

\captionof{chunk}{This is an example of a code caption.}\label{chk:example}

In \cref{chk:example} we do computering.

\end{document}