Preview failed:UnknownError

[Bart@BE]

TV-Server Version: 1.0RC1
MediaPortal Version: 1.0RC1
MediaPortal Skin: Xface
Windows Version: Vista 32-bit
CPU Type: AMD BE-2400
HDD:
Memory: 4GB
Motherboard:
Video Card: ATI X1250 onboard
Video Card Driver:
Sound Card:
Sound Card AC3:
Sound Card Driver:
1. TV Card: Hauppauge PVR 350
1. TV Card Type: Analog
1. TV Card Driver:
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
4. TV Card Type:
4. TV Card Driver:
MPEG2 Video Codec:
MPEG2 Audio Codec:
h.264 Video Codec:
Satelite/CableTV Provider:
HTPC Case:
Cooling:
Power Supply:
Remote:
TV:
TV - HTPC Connection:

Hey,

I have some problems with the configuration of my capture card.
When I preview one of the channels in the TV server management console I get the error: Preview failed:UnknownError

The card is working perfect in windows mediacenter.

The log file is attached.