Asking for Help SAXException

My wife was working in a file, she saved it as .docx an now when she wants to open It this error appears

SAXException: [word/document.xml line 2]: Opening and ending tag mismatch: p line 0 and sdtContent

If I ignore it just a bit of the file opens not all the pages

here is the file

anybody know how to fix it?

thanks in advance

Note that is definitely not a version anyone should use today. Even if someone would want to use v.7.4, they should use the latest bugfix from that branch, which was But these days, using 7.5 (also latest bugfix version) would be my advice.

Thank you so much, we will make sure to follow your advice and use the most current bugfix version.
Thanks again