Chicago Style with BibTeX [closed]

Question

I'm using Zotero Better BibTeX to automatically import the bibliography I need, but it uses BibLaTeX and BibTeX, and I am required to use Chicago style. I think

\usepackage[backend=biber,style=chicago-authordate,natbib=true]{biblatex}

would be perfect. However, I'm having trouble to convert to biber.

When I use biber as a backend, following lockstep's advice, i.e. LaTeX Biber LaTeX, I get no errors, but the in-text citations are the automated keys Zotero generates: author_firsttitleword_date. If I rerun LaTeX, I get a lot of "undefined control sequence \entry" and "\endentry", and the logfile is the following monster:

! Use of \sortlist doesn't match its definition.
l.21   \sortlist{
             nty}{nty}
If you say, e.g., `\def\a1{...}', then you must always
put `1' after `\a', since control sequence names are
made up of letters only. The macro here has not been
followed by the required stuff, so I'm ignoring it.

! Extra }, or forgotten \endgroup.
l.21   \sortlist{nty}
                 {nty}
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.

! Undefined control sequence.
\entry ...ata@\the \c@refsection @\blx@slist@name 
                                             @\abx@field@entrykey 
}\csu...
l.22     \entry{__2004}{article}{}

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

! Undefined control sequence.
<argument> ...equal \expandafter {\blx@slist@type
                                              }{entry} {\listcsxadd {blx...
l.33     \endentry

The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

(This is the first time I ask a question, bear with me)

Would programming a new command make sense here? Stick with BibTeX but use a command making the "(Demmer, 2003: 165)" format into "(Demmer 2003: 165)". Is that possible?