LUA Script nil value

[DrZwitscheri]

Hi all
I have problems with the command: local strUserlist = c_GetUser(mydomain)
Last year (2023) it works, but now no longer.
Where is my fault?
The hole script is:

local mydomain = "xxx.com"
local rootdirtmp = "D:/ftp/kunden/"
local group = "Kunden"
do
local strUserlist = c_GetUser(mydomain)
local userlist = Split(strUserlist,"\n")

for _,username in pairs(userlist) do
local user = c_GetUser(mydomain,username)
local expiretime_t = c_TranslateTime(user.expiretime)
if (os.time() > expiretime_t) and (user.enable_expire == true) and (user.usergroups[1].groupname == group) then
c_DeleteUser(mydomain,username)
c_RemoveFileDir(rootdirtmp .. username)
end
end
end

Thanks a lot at everybody!

[FTP]

OK, if your domain name includes special characters, maybe you can write it as:
local mydomain = urlencode("xxx.com")

[DrZwitscheri]

OK, if your domain name includes special characters, maybe you can write it as:
local mydomain = urlencode("xxx.com")

Thanks for your answer, but we didn't have any special characters. It's like "domain.com"
Nobody has changed something on the script.
With my script, it was running until the end of last year. (2023)
Did you have any other ideas?

[FTP]

OK, special characters include dot, just encode the domain name: local mydomain = urlencode("xxx.com")

[DrZwitscheri]

OK, can you tell me, witch program I can use?

[DrZwitscheri]

I had tried but that doesn't work either