Originally Posted by DJHARKAVY
When I do a 'Check Library' what is meant by
Missing book formats and
extra book formats?
Were there any entries with those?
If that is all you saw
Those are the possible errors
. If there had been one, it would show under the appropriate section, waiting for you to figure 'what to do about it'
(Just delete is not always what you want to do without taking other actions first. Say you incorrectly placed your only copy
of a title into a Calibre controlled folder *bad bad*, you really want to just MOVE it out somewhere else and the Add it in the proper way