"End locked content call does not have a matching start locked content call" message

When defining a tagging rule I get the above message for what normally is a valid regex expression.

What does this message mean?

Trados Studio interface showing a warning message box stating 'End locked content call does not have matching start locked content call.' 



Generated Image Alt-Text
[edited by: Trados AI at 4:15 AM (GMT 0) on 5 Mar 2024]
emoji