"Unable to get major 81" — Video for Linux

I've been trying to bring up our new Meteor II capture board using the emlix 1.0 driver, but I've hit a speed bump. I've built the kernel (v2.4.18-3), v4l2 (20020330), and the driver without any problems (well, none I couldn't figure out), but when I try to modprobe meteor2, I get:

/lib/modules/2.4.18-3custom/kernel/drivers/media/video/videodevX.o: init_module: Input/output error

Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters.

You may find more information in syslog or the output from dmesg

/lib/modules/2.4.18-3custom/kernel/drivers/media/video/videodevX.o: insmod /lib/modules/2.4.18-3custom/kernel/drivers/media/video/videodevX.o failed

/lib/modules/2.4.18-3custom/kernel/drivers/media/video/videodevX.o: insmod meteor2 failed

Looking at the syslog, I see:

Nov 22 19:05:08 gremlin kernel: Video for Linux One (2.2.16). Major device: 81

Nov 22 19:05:08 gremlin kernel: Unable to get major 81 for v4l1/2

There are major 81 devices in /dev already (video0, vtx0, vbi0, radio0, etc.).

Any ideas as to what I'm doing wrong? Thanks in advance.
--
Eric Williams
Controls Group
Advanced Light Source
Lawrence Berkeley Laboratory