That happens when you have a library that's been opened in 5.xx and then you open it in an older version. The database isn't quite compatible.
The only way to fix the error is to use Library > Switch/create library to make an empty library (use "copy structure from existing library") and then use "copy to library" to move them over. Then make sure not to open it in a newer version again.
Last edited by ownedbycats; 02-16-2021 at 05:50 PM.
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