\stopchapter
will render [[error 2]] in place of `\cite[xxx]' because of `referenceprefix' in `\setuphead'. Why? I don't believe `referenceprefix' in `\setuphead' should have something to do with `\cite' at all.
Thankfully, it's pretty rare that one uses `chapter' for bibliography, but still I think it's better to fix this. For instance, right now the following works fine for me:
\setuphead
[chapter][%
referenceprefix={chapter},
]
\setuphead
[title][%
referenceprefix={},
]
...
\cite[xxx]
...
\startpublication[
k={xxx},
t={...},
a={...},
y={...},
]
...
\stoppublication
\starttitle
[title={BIBLIOGRAPHY}]
\whitespace
\placepublications
\stoptitle
NOTE: It's extremely important to explicitly do `referenceprefix={}' for `title' because somehow `title' inherits `referenceprefix={chapter}' from `chapter'; and therefore, not doing `referenceprefix={}' will again result in [[error 2]] in place of `\cite[xxx]'.
Looking forward to your feedback.
Kind regards,
Alexander