Quote:
Originally Posted by kovidgoyal
Use the calibredb command line tool to delete whatever custom columns you have that refer to the removed custom column. Or alternately just import all books from your old library into a new empty library without custom columns, by right clicking on add books and choosing add from folders and sub folders->one book per folder
This will preserve all basic metadata and any custom metadata for columns which you have created in the new empty library with the same name and type as in the old library.
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Phew! calibredb seems to have done the trick. I deleted the saved search and a couple columns I thought were connected to the function using the missing column name, and then I was able to launch calibre with my library.
Thanks so very much for the help!