Error on osmosis-import update (NullPointerException at ReplicationDownloaderConfiguration)

I'm trying to execute the following command to update the map I'm using:

./update.php --import-osmosis-all --no-npi

However, I'm getting this log.

My Linux distribution is a CentOS 6.4.

I tried to research the problem and I've come into this.

I still didn't try because I'm afraid it can damage my current instalation, and we need it running. If there's a huge downtime it will bad. Is it safe to try this solution? Also, I installed Nominatim by following the instructions here.