How to create a development virtual machine for Puppet

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Hi! I am trying to install Puppet Enterprise Master and Puppet Agent in a Vagrant VM for development. This is how I did:

1. vagrant up with Ubuntu 14.04 (I allocated 2.5GB RAM and 4 cores)
2. I downloaded Puppet Enterprise tarball and the .asc key
3. I tried sudo /vagrant/puppet/puppet-enterprise-installer
4. I went to https://vm-ip:3000/
5. I followed the wizard and after some time, this is the error log I got.

What am I doing wrong? How should I actually do it?