The mailing list for listmasters using Sympa

[Ramon Roca <address@concealed>]

Our instance can't sync list members from external data sources.

While looking into the logs, seems that the list of members is obtained 
correctly, saying that got "X" members, tested with retrieving the list 
from url and LDAP with same results.

In the example log provided below, you'll see the message:

info Sympa::List::_include_users_remote_file() 8 included users from 
remote file http://flows.domain.tld:1880/lists/tm_test

However, the inclusion fails. And looking above of the mentioned line, 
there is an error "Unable to open file...":

Sympa::List::_include_users_file#4869 Unable to open file 
"address@concealed"

Below, the complete log provided while trying to refresh the datasource:

Oct  2 18:10:12 llistes wwsympa[8627]: info 
main::do_sync_include(tm_test) [robot llistes.domain.tld] [session 
60022905863525] [client 109.69.9.4] [user address@concealed] [list tm_test]
Oct  2 18:10:12 llistes wwsympa[8627]: err main::#1566 > 
main::do_sync_include#16573 > Sympa::List::sync_include#6683 > 
Sympa::List::_load_list_members_from_include#5997 > 
Sympa::List::_include_users_file#4869 Unable to open file 
"address@concealed"
Oct  2 18:10:12 llistes wwsympa[8627]: err main::#1566 > 
main::do_sync_include#16573 > Sympa::List::sync_include#6683 > 
Sympa::List::_load_list_members_from_include#6012 Inclusion include_file 
failed in list Sympa::List <address@concealed>
Oct  2 18:10:12 llistes wwsympa[8627]: info 
Sympa::List::_include_users_remote_file() 8 included users from remote 
file http://flows.domain.tld:1880/lists/tm_test
Oct  2 18:10:12 llistes wwsympa[8627]: err main::#1566 > 
main::do_sync_include#16573 > Sympa::List::sync_include#6695 Errors 
occurred while synchronizing datasources for list Sympa::List 
<address@concealed>
Oct  2 18:10:12 llistes wwsympa[8627]: notice 
Sympa::Spindle::ProcessTemplate::_twist() Processing 
Sympa::Message::Template 
<address@concealed,4433>; 
address@concealed; 
address@concealed; 
recipients=ARRAY; address@concealed; 
template=listmaster_notification; type=sync_include_failed
Oct  2 18:10:12 llistes wwsympa[8627]: notice Sympa::Bulk::store() 
Message Sympa::Message::Template 
<address@concealed,4433> is stored into bulk 
spool as 
<address@concealed,8627,460>
Oct  2 18:10:12 llistes wwsympa[8627]: notice 
Sympa::Spindle::ProcessTemplate::_twist() Processing 
Sympa::Message::Template 
<address@concealed,6801>; 
address@concealed; 
address@concealed; 
recipients=ARRAY; address@concealed; 
template=listmaster_notification; type=web_intern_error; action=Command 
process
Oct  2 18:10:12 llistes wwsympa[8627]: notice Sympa::Bulk::store() 
Message Sympa::Message::Template 
<address@concealed,6801> is stored into bulk 
spool as 
<address@concealed,8627,7709>

Any clue of what could be wrong in our instance? Is that "Unable to open 
file..." the problem?