ejabberd 16.01 postinstall.sh fails on centos 7 - linux

Question

I've just installed ejabberd 16.01 on my CentOS 7.1.1503, I have used the rpm installer downloaded from ProcessOne's web site using:
sudo rpm -Uvh ejabberd-16.01-0.x86_64.rpm
The installation went well up until the end, but finally I got an error message (without any description). I took a look into /opt/ejabberd-16.01 and saw everything was in it's place so I've tried running /bin/postinstall.sh manually to see what might go wrong.
When I run the script I get the following output:
-=- ejabberd post installation script -=-
(c) 2005-2015 ProcessOne
* Checking ejabberd installation
usermod: no changes
* Starting ejabberd instance
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
Failed to create main carrier for ll_alloc
Aborted (core dumped)
I get a familiar experience when I start the ejabbered server using:
ejabberdctl start
and then when I try to use ejabberdctl again (to stop/register a user) I get the same result:
1
From searching around I've found some connection to memory issues (erl with centos Failed to create main carrier for ll_alloc)
but this doesn't seem to be the case since I have 1GB of RAM and this is the output of top command: 3
so as you can see I have 573MB of free RAM (shouldn't it be enough??)
any help would be very much appreciated,
Thank you.