Invalid index for marker in Space checker

Created by: Anonymous

Original issue 348 created by @ysavourel on 2013-07-02T04:40:32.000Z:

ERROR: Error while checking spaces.
Invalid index for marker 2
Source fragment: Engineering Process Reference Document

(file sent separately)

This look like a index pointing one character to far or too short from the second position of the pair of special characters that are used to store markers in the coded text.