It looks like you've manually installed the nvidia driver instead of using the Ubuntu packages so your driver path is /usr/lib64/xorg/modules/drivers//nvidia_drv.so instead of /usr/lib/xorg/modules/drivers/nvidia_drv.so and thus the compiz startup script is failing to find it.
It looks like you've manually installed the nvidia driver instead of using the Ubuntu packages so your driver path is /usr/lib64/ xorg/modules/ drivers/ /nvidia_ drv.so instead of /usr/lib/ xorg/modules/ drivers/ nvidia_ drv.so and thus the compiz startup script is failing to find it.