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ok, I found the rootcause: I removed the custom column #boboreadloc.
Some days ago I changed to metadata view screen to one page and adjust the order of own fields by the addition metadata_edit_custom_column_order.
That works well but I don't like to see Koboreadloc. And as I feel I do not need it ... I deleted the field.
That's why I get the error message.
As I still not like to see the column in metadate, I now point in kobo utilities the first entry to any other field. And it seems to work.
No error message anymore.
Get the read percentage into Calibre.
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