system          > callbacks > not registering frozen 'find_format_file'

open source     > 1 > 1 > /home/ousia/ctxbeta/tex/texmf-context/tex/context/base/cont-yes.mkiv

ConTeXt  ver: 2015.07.10 00:05 MKIV beta  fmt: 2015.7.11  int: english/english

system          > 'cont-new.mkiv' loaded
open source     > 2 > 2 > /home/ousia/ctxbeta/tex/texmf-context/tex/context/base/cont-new.mkiv
resolvers       > modules > 'newotf' is loaded
open source     > 3 > 3 > m-newotf.mkiv
fonts           >
fonts           > replacing font loader code by experimental code
fonts           >
close source    > 3 > 3 > m-newotf.mkiv
close source    > 2 > 3 > /home/ousia/ctxbeta/tex/texmf-context/tex/context/base/cont-new.mkiv
system          > files > jobname 'a', input './a', result 'a'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
open source     > 2 > 4 > /home/ousia/a.tex
fonts           > preloading modern-designsize (math)
fonts           > typescripts > unknown library 'modern-designsize'
fonts           > 'fallback modern-designsize mm 12pt' is loaded
fonts           > preloading modern-designsize (mono)
fonts           > 'fallback modern-designsize tt 12pt' is loaded
fonts           > defining > source file 'GFSDidot.otf' is not found
backend         > xmp > using file '/home/ousia/ctxbeta/tex/texmf-context/tex/context/base/lpdf-pdx.xml'
pages           > flushing realpage 1, userpage 1
close source    > 2 > 4 > /home/ousia/a.tex
close source    > 1 > 4 > /home/ousia/ctxbeta/tex/texmf-context/tex/context/base/cont-yes.mkiv

!LuaTeX error: cannot find OpenType font file for reading ()
 ==> Fatal error occurred, no output PDF file produced!