Cannot open text file - SAXException: [word/document.xml line 2]: Opening and ending tag mismatch: sdtContent line 2 and txbxContent

Please help me! I cannot open my text file which is written i LO, but saved in .docx format.
It is one week since my back up file. I’m writing a book… Believed LO was usable…
My LO version is: 7.3.2.2
The failure message was: SAXException: [word/document.xml line 2]: Opening and ending tag mismatch: sdtContent line 2 and txbxContent

Installes LO 7.4 - not solved.

Always save in the LibreOffice native ODF formats like .odt for text, and only export to alien formats like .docx when needed.

Other than that, your file maybe could be fixed, but you would have to (publicly) attach it to your question here so someone could actually take a look. Use the … three dots and then Pen icon to edit your question and then the Upload icon to attach the file.

Thank you. I managed to open an earlier version.