I also got this a few times:

Expression    : ini_file.section_exist(section)
Function      : CTradeParameters::process
File          : e:\stalker\x-ray source\x_ray_coc\xray-16\src\xrgame\trade_parameters_inline.h

Line          : 111

Description   : cannot find section generic_buy

stack trace:
0023:005D704A xrCore.dll, xrDebug::fail()
0023:04C33F4C xrGame.dll, CxIOFile::Open()
0023:0267C2EE luabind.beta7-devel.rc4.dll, luabind::detail::implicit_cast()
0023:005D8337 xrCore.dll, str_container::dock()