New setup. Error installing WHMCS via script

I have just installed Virtlualmin on my digital ocean droplet. I created a domain for my hosting website and tried to install WHMCS using the script included with Virtualmin GPL. I get the following:

Found http://software.virtualmin.com:80/download/whmcs_v5215.zip in cache .. Found http://downloads2.ioncube.com:80/loader_downloads/ioncube_loaders_lin_x86-64.zip in cache ..

Configuring webserver PHP settings …
… already done.
Applying web server configuration …
… done

Now installing WHMCS version 5.2.15 …
Account creation did not succeed
More information on using this script can be found at http://www.whmcs.com/members/aff.php?aff=4115.

… installation was only partially complete.
Re-loading Webmin …
… done

Applying web server configuration …
… done

Any idea what I might be missing?

I have the same bug:

Now installing WHMCS version 5.2.15 …

Account creation did not succeed

More information on using this script can be found at http://www.whmcs.com/members/aff.php?aff=4115.

… installation was only partially complete.

Re-loading Webmin …
… done

Applying web server configuration …
… done