[Exim] main option "virtual_domains" unknown

I'm trying to get virtual domains working but I guess I'm missing
something

This is what I have in my config file:


virtual_domains:
driver=aliasfile
domains=LOCAL
file=/usr/local/exim/virtual/${domain}/aliases
search_type=lsearch



And this is the error I'm getting:

[Server:~] w1r3d90d% sudo /usr/exim/bin/exim -bd -d
Password:
Exim version 4.10 uid=0 gid=0 pid=544 L=834cd8 D=fff7577f
probably Berkeley DB version 1.8x (native mode)
changed uid/gid: forcing real = effective
uid=0 gid=0
auxiliary group list: 0
LOG: PANIC DIE
Exim configuration error in line 219:
main option "virtual_domains" unknown
search_tidyup called
>>>>>>>>>>>>>>>>>> Exim pid=544 terminating with rc=1 >>>>>>>>>>>>>>>>>>

Any advice?