Compile Error

Every time I try to compile into any format that isn’t a direct print, Scrivener WILL compile the project into a document. However, when I go to open that document, I get an error screen:

Help! Does anybody know how to fix this, or get around it? If this was a linear story, it wouldn’t be such a problem, not being able to compile, but I’m constantly changing the order of the files, and I need to be able to compile.