Does "unable to find the metadata" mean when you tried to download metadata for the books, none was found? If so, that will depend on the metadata sources you use and whether any had the books you were looking for. Or the metadata that you had matched close enough to be considered a match for the book.
If you only use a small number of sources, it could be the sites have changed and the plugin has to be updated. There have been a couple of reports like that in the last few days. I can't remember which other than that they were non-English site. And I haven't noticed any problems with the sites I use.
If there are problems with the metadata download, the log should show the errors. Post that and we can have a look at it.
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