Hi,
Following an update TeXlive 2014, the compilation of my old files causes the same error :

loading         : ConTeXt File Macros / Helpers
! LuaTeX error ...ab/texlive/2014/texmf-dist/tex/context/base/file-ini.lua:49: attempt to call local 'implement' (a nil value)
stack traceback:
    ...ab/texlive/2014/texmf-dist/tex/context/base/file-ini.lua:49: in function 'code'
    ...ab/texlive/2014/texmf-dist/tex/context/base/util-lua.lua:84: in function 'loadedluacode'
    ...ab/texlive/2014/texmf-dist/tex/context/base/luat-env.lua:104: in function 'luafilechunk'
    ...ab/texlive/2014/texmf-dist/tex/context/base/luat-cod.lua:45: in function 'registercode'
    [\directlua]:1: in main chunk.
\registerctxluafile ...ua.registercode("#1","#2")}
                                                 
l.31 \registerctxluafile{file-ini}{1.001}
                                      
?

Best regards,

Fabrice