Read values in scheduled script store in ftp

[Rauschentofft]

I am going use scheduled script. Every 6th hour it should read the meters and store it ftp and then send an mail.
Then i want to delete the file after the email is sent.

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I tried with this script and made the changes but i got this error:

Error log:
test 11.01.2021 17:16:00
User script:7: attempt to index global 'event' (a nil value)
stack traceback:
User script:7: in main chunk

--Write data to a file in the local FTP

value = grp.getvalue('16/1/1')


logdate = os.date('%Y.%m.%d %H:%M:%S', os.time())
csv = string.format('%q,%q,%q,%q\r\n', logdate, event.dst, grp.alias(event.dst), tostring(value))

log(csv)


file, error = io.open("/home/ftp/outdoor_temp1.txt","a")
log(file,error)
file:write(csv)
file:close()