MultiMarkdown to Rich Text Compile Error

I write everything in MultiMarkdown. Up until this point, I have compiled everything from MultiMarkdown to HTML or plain text. I have not had any issues.

However, today when I attempted to compile my book manuscript from MultiMarkdown to Rich Text, I got the following error:

I reinstalled MultiMarkdown 4.1, along with the Support files, from Fletcher Penny’s site. I then re-booted my Mac. However, I am still getting the same error.

I am using Scrivener 2.4.1 on Mac OS X 10.8.4.

By the way, I tried this from several project files, thinking perhaps my project was corrupt. I am getting the same error message regardless of the project.

How can I fix this?