error help

[adi]

Hi there!!,
   can any one help me with these errors, what do they mean and how
do i resolve them

OPTLINK (R) for Win32  Release 8.00.12
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
C:\Users\LOGICT~1\AppData\Local\Temp\.rdmd\rdmd-main.d-68F08AE56B791207D2A55B3DD37498A5\objs\main.obj(main)
   Error 42: Symbol Undefined _D4core6memory2GC6extendFPvkkZk
C:\Users\LOGICT~1\AppData\Local\Temp\.rdmd\rdmd-main.d-68F08AE56B791207D2A55B3DD37498A5\objs\main.obj(main)
   Error 42: Symbol Undefined
_D4core6memory2GC6qallocFkkZS4core6memory8BlkInfo_
C:\Users\LOGICT~1\AppData\Local\Temp\.rdmd\rdmd-main.d-68F08AE56B791207D2A55B3DD37498A5\objs\main.obj(main)
   Error 42: Symbol Undefined _D4core5bitop3bsrFNaNbkZi
--- errorlevel 3