Site upgraded to D9, and trying to export a vbo view to excel throws an error, but works fine in drupal 8
create a view add a rest export to it, and select excel export as format and pick xslx and add fields, when you run the view and click on export to excel, it throws notices for field_override index missing
need to check the vbobaseexport.php file
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I've faced the same issue with vbo_export: 4.1.3 when I'm doing the batch job. Here I've attached the screenshot what I got during batch-job.
and it's fixed simply by adding isset().
I've applied patch for it. Please test with vbo_export: 4.1.3 version.
Thank you !