[NTG-context] minimal

I just downloaded a minimal with ./first-setup.sh and get symbols : loading symbolset nav (/usr/local/texlive/2010/texmf-dist/tex/context/base/symb-nav.tex) ! Undefined control sequence. \@@iafieldlayer ->\currentviewerlayer \doif #1#2->\edef \!!stringa {#1 }\edef \!!stringb {#2}\ifx \!!stringa \!!str... <inserted text> ...}\doif \@@iafieldlayer \v!auto {\def \@@iafieldlayer {\cu... \dodosetupinteraction ...e \everysetupinteraction l.25 \setupinteraction[\c!symbolset=navigation 1] ? Herbert