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I'm getting this bizarre warning when using biber 2.14 (biblatex 3.14).
Package biblatex Warning: No driver for entry type ''.
(biblatex) Using fallback driver on input line 131.
Line 131 reads: \printbibliography[heading=bibintoc]
How is this possible? My bibliography file was created with BibDesk and is valid.
As explained by moewe, this warning occurs when using an undefined entry type in the .bib file.
In my case, I updated to TeX Live 2020 some time after creating the .bib file; a part of that update was that the APA style for biblatex got updated to comply with the 7th edition. I was using @newsarticle in my bibliography, but this entry type has been removed in the latest version of biblatex-apa. Hence, the warning.
In case anyone wants to use @newsarticle regardless: \usepackage[style=apa6]{biblatex} or something similar should do the trick.
Better yet: Use @article instead, and replace the field newspaper with journal.
biblatexand Biber are you using? Do you use a custom data model? There were some changes to the entry field/type name normalisation in recent Biber updates that might have caused something like this. But I thought that was resolved. Is there any chance you can show us a small, yet fully compilable example document that reproduces the warning (tex.meta.stackexchange.com/q/228/35864, tex.meta.stackexchange.com/q/4407/35864)? – moewe May 18 '20 at 20:33.bibentry that reproduce the warning. Any chance you could cobble something together? – moewe May 19 '20 at 11:40