bd rb error!

hi, i am getting this error message when using bd rebuilder:

'x264.exe has stopped working'

here's the log:

20:35:18] BD Rebuilder v0.31.02 (beta)
- Source: THE_DARK_KNIGHT
- Input BD size: 34.76 GB
- Approximate total content: [02:32:13.332]
- Target BD size: 22.46 GB
- Windows Version: 6.0 [6002]
- MOVIE-ONLY mode enabled
- Audio Settings: AC3=1 DTS=0 HD=1 Kbs=640
[20:35:18] PHASE ONE, Encoding
- [20:35:18] Extracting A/V streams [VID_00007]
- [21:13:20] Reencoding: VID_00007 (1 of 1)
- [21:13:20] Collecting video information
- Video: 1920x1080, 23.976fps, 218,981 frames
- Bitrate: 18,943 Kbs
- [21:13:20] Reencoding: VID_00007, Pass 1 of 2
- [21:13:22] Reencoding: VID_00007, Pass 2 of 2

anyone help?
thanks