in classicthesis, change acronym hyperlink colour (to black) but leave crosslinks blue

I am trying to change the acronym link colours in classicthesis to black but leave other links their default colours. I have tried the solution listed here: Acronym hyperlink without special color

However when I try that solution (see below), the document no longer compiles

\AtBeginDocument{% \renewcommand*{\AC@hyperlink}[2]{% \begingroup \hypersetup{hidelinks}% \hyperlink{#1}{#2}% \endgroup }% }

I get the error:

Undefined control sequence. (\hypersetup ...)