make: *** [pdf] Error 43 when using other `pdf-engine`

[luceat-lux-vestra]

It caused by in preamble.tex

\usepackage{xunicode}
\usepackage{xltxtra}

I changed to

\ifxetex
  \usepackage{mathspec}
  \usepackage{xltxtra,xunicode}
\else
  \usepackage{fontspec}
\fi

from template.tex and no problem(with LuaLaTeX).