I don't know why but you need to use non-LaTeX fonts Document > Settings > Fonts.
I exported the file to LaTeX and there is a command \usepackage[garamondx]{newtxmath} This gives the same errror as in LyX but if I remove the [garamondx] option it compiles. Selecting the non-LaTex fonts will give you the Garamond font. On 19 March 2016 at 11:27, emil sjoerup <emilsjoe...@live.dk> wrote: > Hello LyX users. > I have a problem which I cannot seem to solve, even trying to use the good > ol’ google theorem. > > Attached is a document with only the text “Title” which gives me the error > shown in the attached picture. > > I have changed some settings in my configuration of LyX. I have added > hotkeys for \partial, \cdot and \frac plus I have changed the font > settings. I do not know if this info is relevant or sufficient. > > Have a great easter. > Emil > -- John Kane Kingston ON Canada