I am using the ConTeXt-SBL package for citations. I need to move my footnotes to the end of each article.

According to the manual, I can suppress the placement of footnotes using two lines of code. I've added these to my minimal working code, placing \setupnote[footnote][location=none] in the header and  \placenotes[footnote] where I want the endnotes to appear. It complains this error:
"Undefined control sequence \doifendswithpunctelse"
What did I do wrong?
--Joel
Code follows:

\usemodule[publ-imp-sbl]
\startbuffer [bib]

@Article{na2006,
title={Volcanoes \word{of} New Mexico},
year={2006},
journal={New Mexico Earth Matters},
publisher={New Mexico Bureau \word{of} Geology \word{and} Mineral Resources},
volume={6},
number={1},
location={Socorro, New Mexico}
}

@Book{clark1989,
author = {Clark, William},
title = {Railroads \word{and} railroad towns \word{in} New Mexico},
publisher = {New Mexico Magazine},
year = {1989},
address = {Albuquerque, New Mexico},
isbn = {9780937206126}
}

\stopbuffer

\usebtxdataset[bib.buffer]

\setupbtx[dataset=default]
\usebtxdefinitions[sbl]
\setupbtx[sbl]

\setupnote[footnote][location=none]

\starttext

   \input knuth
    \cite[clark1989]

    \placenotes[footnote]

    
    \startchapter[title=Bibliography]
        \placelistofpublications
    \stopchapter

\stoptext