聚合物与PHP和单独的服务器

I've managed to get Polymer setup with an application and can test it using "polymer serve". However I would also like to use it with PHP. I have an Apache PHP server setup in OSX but when I view my project I get the following message:

"@polymer/polymer/polymer-element.js". Relative references must start with either "/", "./", or "../".

I have tried using the "polymer build" command and running from that folder but no success. Anyone know how to fix this?

Thanks in advance