Required parameter error using Presenter

I'm still using Presenter and am trying to update a course. The only changes I've made to the previous version which I updated in 8/24 was to swap out files for links in my resources tab. Now when I publish to LMS as SCORM 1.2 and upload to the LMS, I'm getting the following error message. Based on another comment here, I've gone in and checked to make sure the external resources folder is included in the zip file (which it is). What else might be causing this error message? It's not that I've timed out either.

A required parameter (id) was missing.

This error happens when a webpage expects a parameter to be passed from another page (by post or cookie), and it fails to do so.

This happens sometimes when user session times out, due to inactivity, or when an URL that needs that mandatory parameter is instead directly typed in URL bar or invoked from browser bookmarks, like the SCORM Player page not being launched from a link in the course page.