I made a course with one section and one lesson and got the following error when I clicked complete lesson:
No query results for model [FluentCommunityModulesCourseModelCourse] 2
Most of the message isn't visible because of the size of the alert box.
Nicholas Bostic is the error for a course with Published status or Draft status? I remember I had this error when I tried to complete a course with Draft status - linking the post here