lua crashed on luaS_newstr when require 'qtgui' only

[starwing]

I'm on windows, and I used pre-compiled package and the dlls I compiled myself, I can make it work when I use:

require 'qtcore' require 'qtgui'

but if I only write:

require 'qtgui'

the lua.exe crashed, and gdb says there is a SIGSEGV in luaS_newstr, what's the matter?