I thought I had removed all references to skins/containers that no longer exists, but after I read your post I went back and checked several more pages and found references to "/Portals/_default/Containers/None/No Container.ascx" which no longer exists.  I have deleted those on several pages and it works. 

I then used a script that I found on another website, http://letitshine.biz/Support/DNN-Support-Blog/aft/21, to cycle through TabModules and set the ContainerSrc to Null for those entries that had the bad no_container reference.  It found 221 entries.  However, If I don't go to each page that had a reference to the No_Container and click Update, the page still has an error.  I have tried to clear cache, reset application and even rebooted the server, but unless I actually click Update on the edit page for each page the error still shows up.

One of the issues with cleaning up the server after the upgrade to 8.0.3 is that the server has about 30 websites.  Checking each website and each page is a pain!