Transcode fails to generate frame preview

when I try to get grab frames, I get that error:

Job 'Grab preview - title #2' failed with error message:
Command exits with failure code:
Command: mkdir -m 0775 /tmp/dvdrip7724.ppm; cd /tmp/dvdrip7724.ppm;
execflow transcode  -H 10 --print_status 25 -o snapshot -y ppm,null -x
vob,null -i \/media\/500GB\/Backup\/dvdRip\-data\/DejaVu\/vob\/002\/
-S 16 -c 10-11 -L 1699576 && execflow convert -size 720x576
/tmp/dvdrip7724.ppm/snapshot*.ppm
/media/500GB/Backup/dvdRip-data/DejaVu/tmp/DejaVu-002-preview-orig.jpg
&& execflow convert -size 720x576 /tmp/dvdrip7724.ppm/snapshot*.ppm
gray:/media/500GB/Backup/dvdRip-data/DejaVu/tmp/DejaVu-002-preview-orig.raw
&& rm -r /tmp/dvdrip7724.ppm && echo EXECFLOW_OK

Output: transcode v1.0.4 (C) 2001-2003 Thomas Oestreich, 2003-2004 T.
Bitterberg, 2004-2007 Transcode Team
tc_memcpy: using sse for memcpy
[import_null.so] v0.2.0 (2002-01-19) (video) null | (audio) null
[import_vob.so] v0.6.0 (2003-10-02) (video) MPEG-2 | (audio)
MPEG/AC3/PCM | (subtitle)
[transcode] warning : /usr/lib/libavcodec.so.51: undefined symbol: NeAACDecOpen
[transcode] (probe) suggested AV correction -D 0 (0 ms) | AV 0 ms | 0 ms
[transcode] auto-probing source
/media/500GB/Backup/dvdRip-data/DejaVu/vob/002/ (ok)
[transcode] V: import format    | MPEG    (V=vob|A=null)
[transcode] V: AV demux/sync    | (0) sync AV at PTS start - demuxer disabled
[transcode] V: import frame     | 720x576  1.25:1  encoded @ 16:9
[transcode] V: bits/pixel       | 0.174
[transcode] V: decoding fps,frc | 25.000,3
[transcode] V: Y'CbCr           | YV12/I420
[transcode] A: import format    | 0x2001  AC3/A52      [48000,16,2]  448 kbps
[transcode] A: export           | disabled
[transcode] V: encoding fps,frc | 25.000,3
[transcode] A: bytes per frame  | 7680 (7680.000000)
[transcode] A: adjustment       | 0@1000
[transcode] V: IA32/AMD64 accel | sse2 (sse2 sse mmxext mmx asm C)
[transcode] V: video buffer     | 10 @ 720x576
[transcode] warning : (dl_loader.c) loading
"/usr/lib/transcode/export_ppm.so" failed
[transcode] warning : (encoder.c) loading video export module failed
[transcode] warning : failed to init export modules
[transcode] critical: plug-in initialization failed

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I am running Fedora 8.

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