I've recently switched servers and have thin client cds I need to reconfigure to the new server (2008 R2)

The problem is I keep getting the no valid session type error when the thin client cd boots:

Code:
KEYBOARD_MAP=en_usTIME_ZONE="Etc/GMT+10"
NET_USE_DHCP=On
NET_HOSTNAME=ThinTest


SESSION_0_TITLE="Server1"
SESSION_0_TYPE=rdesktop
SESSION_0_RDESKTOP_SERVER=Server Name
SESSION_0_AUTOSTART=On




SCREEN_RESOLUTION="1280x1024 | 1024x768 | 800x600 | 640x480 | *"
SCREEN_COLOR_DEPTH="24 | 16 | 8 | *"


ICA_USE_SERVER_KEYBOARD=Off
ICA_BROWSER_PROTOCOL=HTTPonTCP
ICA_SERVER=
ICA_ENCRYPTION=Basic
ICA_COMPRESS=On
ICA_AUDIO=On
ICA_SMARTCARD=Off
ICA_AUDIO_QUALITY=Low
ICA_PRINTER=Off
ICA_SEAMLESS_WINDOW=Off
Above is an example of the configuration file I've remade but it's no longer working. What could be causing the problem?

Thanks in advance I'm getting a newer version of thin station iso hopefully that'll fix the problem.