If you are running walmgr for log shipping with PostgreSQL and you see the below error in your postgresql.log file it is because you are missing the recovery.conf file. The recovery.conf file should be located in your data directory on the slave server which typically is /var/lib/pgsql/data.
CDTWARNING: archive_mode enabled, yet archive_command is not set
This means you probably have not run the below command as the postgres user on the slave server which is the command that actually generates the recovery.conf file.
walmgr.py slave.ini restore
If you attempt to run the above command and end up with an error you should go back through the entire setup process again which includes performing a backup from the master database server.