Adding Actor names - Just unknown

So i got problem by adding Actors by copiing missing infos. Here source site for info with acters. Image may be NSFW.
Clik here to view.
As you can see here are 10 actors. I select them all and copy.
Then i paste (ctrl+c) to plex. Image may be NSFW.
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It copy just 9 because they are not added somwhere else. But i allready added movie with Jean Reno. And Jean reno its actually missing.
So i have to add him manually. Image may be NSFW.
Clik here to view.