LTSP error unrecognized option

[RuRat]

rurat@HomeMAIN:~$ sudo ltsp-update-image --arch i386
/usr/sbin/ltsp-update-image: unrecognized option '--arch'
rurat@HomeMAIN:~$

I get this error when i try to run this command
what am i doing wrong

[RuRat]

i tried excluding --arch i386
and was successful


rurat@HomeMAIN:~$ sudo ltsp-update-image
Parallel mksquashfs: Using 2 processors
Creating 4.0 filesystem on /opt/ltsp/images/i386.img.tmp, block size 131072.
[========================================================================================================================================\] 33742/33742 100%

Exportable Squashfs 4.0 filesystem, gzip compressed, data block size 131072
compressed data, compressed metadata, compressed fragments, compressed xattrs
duplicates are removed
Filesystem size 344925.31 Kbytes (336.84 Mbytes)
41.03% of uncompressed filesystem size (840626.68 Kbytes)
Inode table size 436420 bytes (426.19 Kbytes)
29.03% of uncompressed inode table size (1503527 bytes)
Directory table size 413875 bytes (404.17 Kbytes)
41.28% of uncompressed directory table size (1002518 bytes)
Number of duplicate files found 1343
Number of inodes 42616
Number of files 29856
Number of fragments 2538
Number of symbolic links 8784
Number of device nodes 82
Number of fifo nodes 0
Number of socket nodes 0
Number of directories 3894
Number of ids (unique uids + gids) 22
Number of uids 4
root (0)
pulse (106)
libuuid (100)
syslog (101)
Number of gids 20
root (0)
video (44)
audio (29)
tty (5)
mlocate (107)
kmem (15)
disk (6)
shadow (42)
syslog (103)
mail (8)
landscape (109)
ssh (108)
messagebus (105)
utmp (43)
netdev (110)
staff (50)
pulse (115)
libuuid (101)
adm (4)
fuse (104)
Updating /var/lib/tftpboot directories for chroot: i386
rurat@HomeMAIN:~$