I am pretty sure you cannot use entry types that are not defined
in bibtex-BibTeX-entry-alist or bibtex-biblatex-entry-alist. You can add
types to those variables to get them to work.

John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu


On Sun, Sep 10, 2017 at 2:50 PM, Johannes Brauer <brauer@nordakademie.de>
wrote:

> Hi!
>
> isn’t it allowed to use bibtex entries @url or @webpage? Using one of them
> the html export complains that the entry is not found, for example:
>
> Carro1998 not found in /Users/johannes/Documents/lehre/Informatik/
> Programmierparadigmen/Vorlesung/referenzen.bib
> org-ref-get-bibtex-entry-citation: Wrong type argument: stringp, nil
>
> Johannes