Kernel Oops - BUG: unable to handle kernel NULL pointer dereference at (null); EIP is at nouveau_fence_update+0xe/0xe0 [nouveau]

When I install the "ME TV" software , the screen shutdown and report a bug. It seems the bug is related to a NULL pointer in the kernel ,about net.

ProblemType: KernelOops
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Annotation: Your system might become unstable now and might need to be restarted.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: chenjz 1504 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf5500000 irq 48'
   Mixer name : 'Conexant CX20561 (Hermosa)'
   Components : 'HDA:14f15051,17aac001,00100000'
   Controls : 16
   Simple ctrls : 8
Card1.Amixer.info:
 Card hw:1 'NVidia'/'HDA NVidia at 0xf5000000 irq 16'
   Mixer name : 'Nvidia GPU 0b HDMI/DP'
   Components : 'HDA:10de000b,10de0101,00100100'
   Controls : 16
   Simple ctrls : 4
Date: Mon Apr 4 10:07:02 2011
Failure: oops
HibernationDevice: RESUME=UUID=31e08f46-0244-43ae-b080-19cdd190de32
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110302)
MachineType: LENOVO 20022
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-7-generic root=UUID=0701e06a-50a1-4232-bfa2-088dbe0207e0 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic N/A
 linux-firmware 1.49
SourcePackage: linux
Title: BUG: unable to handle kernel NULL pointer dereference at (null)
UpgradeStatus: Upgraded to natty on 2011-04-02 (1 days ago)
dmi.bios.date: 08/21/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 18CN33WW(V2.06)
dmi.board.name: NITU1
dmi.board.vendor: LENOVO
dmi.board.version: REFERENCE
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnLENOVO:bvr18CN33WW(V2.06):bd08/21/2009:svnLENOVO:pn20022:pvrLenovoG450:rvnLENOVO:rnNITU1:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.name: 20022
dmi.product.version: Lenovo G450
dmi.sys.vendor: LENOVO