How to remove a rootFile (a nil value) from your LR catalogue?
Yes, sometimes you have to deal with more then one problem in two days. Yesterday's problem is fixed with a help from a very kind person, this morning I have another "problem". When importing and deleting some files, a file appeared in my catalogue. It's grey and it got no content, no value. I can't remove it from the catalogue either. Of course I searched for an solution here, but no solution yet. I enabled all the plugins, I optimized the catalogue, but no change. Is there a way to get rid of this file?

