2.0.0alpha5 xetex (texlive 2011/dev) failure

First try with lyx 2.0.0alpha5 of xetex. Log is attached. Failure is ! Undefined control sequence. l.67 \ExplSyntaxOn This is XeTeX, Version 3.1415926-2.2-0.9997.4 (TeX Live 2011/dev) (format=xelatex 2010.11.9) 9 NOV 2010 08:20 entering extended mode restricted \write18 enabled. %-line

2.0.0alpha5 xetex (texlive 2011/dev) failure

First try with lyx 2.0.0alpha5 of xetex. Log is attached. Failure is ! Undefined control sequence. l.67 \ExplSyntaxOn This is XeTeX, Version 3.1415926-2.2-0.9997.4 (TeX Live 2011/dev) (format=xelatex 2010.11.9) 9 NOV 2010 08:20 entering extended mode restricted \write18 enabled. %-line

2.0.0alpha5 xetex (texlive 2011/dev) failure

First try with lyx 2.0.0alpha5 of xetex. Log is attached. Failure is ! Undefined control sequence. l.67 \ExplSyntaxOn This is XeTeX, Version 3.1415926-2.2-0.9997.4 (TeX Live 2011/dev) (format=xelatex 2010.11.9) 9 NOV 2010 08:20 entering extended mode restricted \write18 enabled. %&-line