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Try this
this file where I have attempted to correct it.
Several points:
1 The file_name is a .odt file, but the file is actually a .docx file.
Question 1: Did you rename the file to .docx?2 As the file is a .docx it was presumably created either with MS Word or with LibreOffice - AOO cannot
write .docx files.
Question 2: Are you using LibreOffice? MS Word? Or did your editor use LibreOffice? MS Word? It would be useful to know the history of the file to understand when the corruption occurred.3 The file has had Edit > Change ..., applied - yet again a problem with Edit > Changes
4 The .docx file showed an error w:themecolor redefined.
I therefore extracted \word\document.xml from the .docx file - the docx file is actually a ZIP file, so I just unZIPped it. I opened it in Notepad++ and searched for w:themecolor and deleted the
second instance of
w:themeColor="accent1" each time it occurred, leaving the trailing / as below. I then put document.XML back into the .docx file which then opened normally.
Note that it is easier to find the repeated occurrences if you "pretty print" the XML using the XML Tools plugin for Notepad++. If you do, be sure to
Linearise the XML before saving it or lots of tabs and newlines will be saved in the file which then appear in the repaired document.

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<w:rPr>
<w:sz w:val="20"/>
<w:szCs w:val="20"/>
<w:highlight w:val="yellow"/>
<w:rFonts w:ascii="Times New Roman" w:hAnsi="Times New Roman" w:cs="Times New Roman"/>
<w:color w:val="5B9BD5" w:themeColor="accent1" w:themeColor="accent1"/>
</w:rPr>

- Second instance of w:themeColor="accent1" deleted each time it occurred, leaving the trailing /
This image shows Notepad++ without invoking the "pretty print" add-on.