If you get the following error while doing a deployment of the maven site... you may have a surefire plugin that is not version-ed.
The following is from the plugin's site
Note: As of version 2.8 this plugin requires Maven Site Plugin 2.1 or higher to work properly. Version 2.7.2 and older are still compatible with newer surefire versions, so mixing is possible.
I used the following to fix it