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ERROR: JS+ GUI Tool: No Comments/Long-Text Custom Column Was Selected.
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Clearly you did not click a cell in the Target Library column to "tell" that GUI Tool which column you wanted to update. I suspect that you selected a bunch of books, and paid no attention to where your cursor was just before you invoked that GUI Tool. The name of the GUI Tool includes the phrase "Selected Column". That implies that you must select some cell within a column for it to be "selected".
There is absolutely no logical reason that I can surmise for Bulk Metadata Edit to not include the ability to mass-change Comments/Long-Text/Short Text/Plain Text Custom Columns. Nevertheless, it does not. Hence, my GUI Tool to add the missing functionality to Calibre. I built that for me, since I use it frequently for Short Texts.
DaltonST