Fix cleveref ?? prefix with floatrow

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}

 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}