Error not sending file via ftp service!

[phongvucba]

Thank admin !
I use script:
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--Take a backup and ftp to NAS
-- name of backup file
src = 'LM_nha_mau_HN-' .. os.date('%Y.%m.%d_%H-%M') .. '.tar.gz'
-- where to put backup file on LM
dst = '/home/ftp/' .. src
-- where to put the backup on NAS
target = '<fpt_user>' .. src

-- prepare files for backup
os.execute('sh /lib/genohm-scada/web/general/backup.sh')

-- create archive
os.execute('cd /lib/genohm-scada/storage && tar -c -z -f ' .. dst .. ' ./')


-- load the ftp support
local ftp = require("socket.ftp")
local ltn12 = require("ltn12")

-- ftp to NAS
f, e = socket.ftp.put{
host = "100.100.100.99",
user = "fpt_user",
password = "gammajsc",
type = "i",
argument = target,
source = ltn12.source.file(io.open(dst, "rb"))

}
if (e) then
log (e)
log (f)
alert("Could not ftp: ", e, "\n")
end
log("ftp_backup")




-- cleanup
os.execute('cd /home/ftp && rm -rf backup_*')
os.execute('cd /lib/genohm-scada/storage && rm -rf user userlib.luas blockly.luas initscript.lua helpers.js genohm-scada.config filter*')
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Am I something wrong? Please help me