|
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.
|