I have a LyX (version 2.2.3) project that uses a .bib file (created using JabRef), in my project I can make citations of all the files included in my .bib file, but when I try to make a PDF preview the citations appear as ?, and when I try to compile the master file it gives these errors on each citation:
Undefined control sequence
Argument of \@citex has an extra }
Paragraph ended before \@citex was complete
Paragraph ended before \NAT@split was complete
I've tried to install manually the natbib package and reconfiguring LyX, but it keeps giving the same error, as if it can't find the natbib package. I've also tried to manually force the inclusion by adding this line in the preamble:
If someone can please shed some light for me on this, I really don't know what I can do anymore, thanks in advance!