Someone else had this issue. Somehow during the copy and paste an escape backslash is lost for the backslash character! If you bring up the actual dialog for the spacing data, you'll see the [5,"I()\"] section is missing a backslash. Just type it back in and it all works: [5,"I()\\"]
It's not clear to who's at fault here - C3, the browser, copy/paste, the text editor used to open the file. It's definitely odd.