Nov 27 21:57:03 prometeo rsyslogd-2068: could not load module '/usr/lib64/rsyslog/lmnsd_gtls.so', rsyslog error -2078 [try http://www.rsyslog.com/e/2068 ]
The suggested link is not useful as the description (module could not be loaded - init failed) is too generic.
The problem here was that in the config file, the line DefaultNetstreamDriverCAFile was pointing to a non existent file.