'could not insert 'zram'' error on vuduo

when installing zram on my vuduo I get following errors:

root@vuduo:~# opkg install zram
Installing zram (0.1-r5) to root...
Downloading http://downloads.pli-images.org/feeds/openpli-4/all/zram_0.1-r5_all.ipk.
 Removing any system startup links for zram.sh ...
Configuring zram.
 Adding system startup for /etc/init.d/zram.sh.
/etc/rc3.d/S05zram.sh: line 53: can't create /sys/block/zram*/reset: nonexistent directory
modprobe: ERROR: could not insert 'zram': Unknown symbol in module, or unknown parameter (see dmesg)

 
and here dmesg output:

zram: module is from the staging directory, the quality is unknown, you have been warned.
zram: Unknown symbol xv_destroy_pool (err 0)
zram: Unknown symbol xv_get_total_size_bytes (err 0)
zram: Unknown symbol xv_create_pool (err 0)
zram: Unknown symbol xv_malloc (err 0)
zram: Unknown symbol xv_free (err 0)
zram: Unknown symbol xv_get_object_size (err 0)

 
not that I need it especially, just wanted to test it out of curiosity (if it's really 'incarnate evil' as it might look reading the forum lately )