Dear Louis, this command is not Biblatex's, but Bibtex's. The style of your bibliography is defined in the preamble. Check page 2 of the Biblatex-Chicago manual: http://ctan.mines-albi.fr/macros/latex/contrib/biblatex-contrib/biblatex-chicago/doc/biblatex-chicago.pdf
You should also read Biblatex's Manual, as it seems you are not defining in your preamble the name of your bib file. Good luck. Regards. ------------------------------------------------- Julio Rojas jcredbe...@gmail.com On Tue, May 24, 2011 at 7:17 AM, Louis Turk <l...@dayspringpublisher.com>wrote: > Hi everyone, > > I'm using Lyx 2.0. I have an English book which uses a few Hebrew and > Greek words. I need to use biblatex-chicago footnote citations with this > book. > > I've installed: > > biblatex > biblatex-biber > biblatex-chicago > > Document class: book (Memoir) > > Modules: Biblatex-citation-styles > > Language: English USA > Encoding: Unicode (XeTex)(utf8) > Language package: Always Babel > > Bibliography: > Citation style: Natbib Author-year > Bibliograpy generation: > Processor: biber > Options: none > > Output: Default output format: PDF (XeTex) > > Preamble: > > \usepackage[hebrew,greek,english]{babel} > \usepackage{fontspec} > \usepackage{csquotes} > \usepackage[backend=biber]{biblatex} > \chapterstyle{bianchi} > \setlength{\hoffset}{0.5 in} > \setlength{\voffset}{0.3 in} > \RequirePackage{microtype} > \renewenvironment{quote}% > {\sffamily\small\list{}{\rightmargin\z@}% > \item[]}% > {\endlist} > \renewenvironment{quotation}% > {\sffamily\small\list{}{\listparindent 1.5em% > \itemindent \listparindent > \rightmargin \z@ > \parsep \z@ \@plus\p@}% > \item[]}% > {\endlist} > > I can insert citations, but when I try to make the PDF file I get the > following error messages: > > Package biblatex Error: ' \bibliographystyle' invalid. > LaTex error: Can be used only in preamble. > > \bibliographystyle{chicago-fa} > > Use the package option 'style' instead. > I'm ignoring the command. > > What am I doing wrong here, and how can I fix it? > > Lou > >