odt output file corrupted

[ft gmail]

Hi,

I try to work on an output table with LibreOffice and export the output 
file with the extension .odt. This creates the following error message 
in LibreOffice:

The ‘{file name.odt}’ file is corrupted and cannot be opened. 
LibreOffice may try to repair the file.
The corruption may be the result of tampering with the document or a 
deterioration in the structure of the document due to data transmission.
We recommend that you do not trust the content of the repaired document.
Macro execution is disabled for this document.
Should LibreOffice repair the file?

I work with LO 24.8.4 under Windows 11.

LO 25.2.0 produced the same error.

Any help appreciated.

- ftr