Screen is white and home page content is completely missing.

Hello,

My site has been up and running just fine for days. Now, I have a complete white screen (when not logged in), when I go to the site. Aside from this, (when logged in (wp-admin)) the custom home page that I built with the Page Builder by SiteOrigin (suggested by the Perth theme) is giving me an error.

When logged in I can view the site home page. All of the parts and colors are there, but the content and icons are completely gone.

Under pages in the editor each section says a version of this phrase:

The widget Perth_Services_Type_A is not available. Please try locate and install the missing plugin. Post on the support forums if you need help.

Please help me fix this! What plugin am I missing?!