Plex . Cannot launch

I think PLEX on my NAS did something simular and I find a fix which was to delete a file, once I did it, it started up just fine.  It took me a while to find it hunting around Google.  So doing a little looking, I found this link in the matter.

https://community.netgear.com/t5/Current-NETGEAR-and-Partners/PLEX-is-failing-to-initialize-with-error-22002010000-on-latest/td-p/1010920#M4218

So PLEX crashed, left around a file and now every time it tries to startup it thinks it's already running and so throws up this error.  This file,

/apps/plexmediaserver/MediaLibrary/Plex Media Server/plexmediaserver.pid

This file is left behind, plexmediaserver.pid in that directory.  If you delete it, PLEX should now boot up.  I fixed this before by SSHing into my NAS.  But I can now get access though it directly from Windows.  But it's in one of the hidden directory's.  You can unhide directory's, but I don't recall off hand how I did it.  You could screw up your NAS deleting stuff you shouldn't which is why it's hidden in the first place.

Here's another link into the matter.

https://forums.plex.tv/discussion/196307/plex-is-failing-to-initialize-with-error-22002010000-on-latest-version-on-readynas-516

Just ignore it being about the readynas 516.  It could just as well apply to your NAS.