Con i codici che hai inviato non ottengo alcun errore.
Prova a compilare questo:
`\documentclass{book}
\begin{filecontents}{tesi.bib}
@online{django:middle,
title = {Writing your own middleware},
year = {2013},
url = {https://docs.djangoproject.com/en/1.5/topics/http/middleware/#writing-your-own-middleware},
sortkey = {Writing your own middleware},
label = {WritingMiddleware},
}
@online{django:media,
title = {Form Media},
year = {2013},
url = {https://docs.djangoproject.com/en/1.5/topics/forms/media/},
sortkey = {Form Media},
label = {FormMedia},
}
@online{django:mixin,
title = {Using mixins with class-based views},
year = {2013},
url = {https://docs.djangoproject.com/en/1.5/topics/class-based-views/mixins/},
sortkey = {Using mixins with class-based views},
label = {UsingMixins},
}
@online{django:friendly,
title = {djangofriendly},
year = {2013},
url = {http://djangofriendly.com/hosts/},
sortkey = {djangofriendly},
label = {DjangoFriendly},
}
@online{django:host,
title = {Django hosts},
year = {2013},
url = {https://code.djangoproject.com/wiki/DjangoFriendlyWebHosts},
sortkey = {Django hosts},
label = {DjangoHosts},
}
@online{loop-github,
title = {django-loop},
year = {2013},
url = {fake.com},
sorkey = {DjangoLoop},
label = {DjangoLoop},
}
\end{filecontents}
\usepackage[autostyle,italian=guillemets, babel]{csquotes}
\usepackage[style=numeric,sorting=none,backend=biber]{biblatex}
\addbibresource{tesi.bib}
\begin{document}
\nocite{*}
\printbibliography
\end{document}`
Se non funziona, cerca di ricreare un esempio che riproduce l’errore
usando come modello il codice che ti ho dato io, eventualmente con meno voci.
La virgola qui
`label = {DjangoFriendly},
}
`
non dà alcun problema.
Ciao
Ivan