Hello! I'm a very beginner in lyx. I started to write a document, and after some time, I wanted to get the PDF preview, but I got the error message: LaTex error: \eqdistribution undefined
LaTex error: \pagedeclaration undefined
LaTex error: \nomname undefined
(Changing the document class: I can get a HTML file, but anyway no PDF)
I'm really not a programmer......I've no idea how to find out.
Please, I need help
