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Many thanks, Kevin.
Ran the 0.97 plugin on the epub that generated the earlier error. This time no error messages were generated.
I was puzzled by the fact that no alt-text entries were added even though the jpg files had alt-text in their metadata. But then I discovered something that I had not noticed before. The files in Images in the Sigil Book Explorer were png files, not jpg files. The jpg files with the metadata had been converted to png files during the export from InDesign and all the metadata was stripped in the process.
When I re-exported using the Existing Image for Graphic Object. everything worked as expected with the plugin.
Many thanks for this Kevin. I think I will now change my workflow to save the alt-text in the Image metadata and remember to use the Existing Image during the export from InDesign.
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