Synced items mark as "Unavailable"



I synced several episodes from my Plex server to my notebook's Windows App. For example i synched all Series of XXX (only unviewed episodes, without limit ) and In Home>Status, XXX is marked as "Sync complete". But when i go to TV Show the first episode is marked as "Unavailable" but i don't understand Why. Somebody come help me? Thanks.


some one can help me?