Error Ocuured while building DWT

[Olagsfark via Digitalmars-d-dwt]

Hi guys(and ladies), i cloned the dwt repository this morning at 
about 7:45am and after cloning completed, i tried to build the 
dwt library with the
$ rdmd build base swt
command provided in the dwt github page's readme.
Here and right in my face i got this pool horror...error

[pre]
(in C:\Users\kolawole\Desktop\codetmp\dwt)
Building dwt-base
workdir=>C:\Users\kolawole\Desktop\codetmp\dwt\base\src
dmd.exe @C:\Users\kolawole\Desktop\codetmp\dwt\rsp
java\nonstandard\sync\condition.d(85): Error: 
java.nonstandard.sync.exception.SyncException at java\nonst
andard\sync\exception.d(26) conflicts with 
core.sync.exception.SyncException at C:\dmd\src\druntime\impor
t\core\sync\exception.di(3)
java\nonstandard\sync\condition.d(90): Error: 
java.nonstandard.sync.exception.SyncException at java\nonst
andard\sync\exception.d(26) conflicts with 
core.sync.exception.SyncException at C:\dmd\src\druntime\impor
t\core\sync\exception.di(3)
object.Exception at build.d(251): compile error
----------------
0x004049F6
0x00405AC5
0x00403C05
0x004165BA
0x0041658F
0x004164A5
0x0040FE77
0x772F3833 in BaseThreadInitThunk
0x778DA9BD in LdrInitializeThunk
[/pre]

i dont know what happened nor do i know how to fix this.
  I use a windows vista ultimate.

Your quick response(preferably help) will be really appreciated 
guys..Thanks a lot