206: Crossed-out string or inline note not closed

The left cross +- is used together with the right cross -+ to cross out text. The left fork =- is used together with the right fork -= for inline notes. You used one of these left marks without its corresponding right mark within the same block.

Solution

Add the missing right cross -+ to cross out text or the missing right fork -= to mark an inline note within the same block respectively. If you did not mean to use such markup, but want to use a literal plus sign or equals sign followed by a hyphen, prepend a backslash, that is \+- or \=-.

Here is a plus-minus sign to copy and paste, in case you are looking for one: ±