Please check that the file exists and the necessary drive is mounted.

I have a Mac Mini running Mountain Lion Software  OS X 10.8.5 with a WD My Book Essential 2TB External Hard Drive connected to my network through my router: Netgear R6300 This problem just showed up out of thin air.  I haven't changed any settings, no upgrade or anything.  I cant access my movies from plex, it gives me this error: "Please check that the file exists and the necessary drive is mounted."  It also has Unavailable beside every movie.   The drive is mounted and I can play my movies directly from the drive, accessing it through Finder.  I can also access them through my DLNA server on my Sharp TV and my Visio TV in the bedroom.  It shows up as READYSHARE in finder.  The only other time I've had a simular problem is when my Mac goes to sleep and it loses the hard drive.  I installed Caffeine and although I'm sure there is another way to remedy this, thie seemed to take care of that problem for me.  I'm stumped on this one and any help would be very much appreciated!!!  Thank you in advance...............  Tommy  

This same error started for me as well today. I was watching several episodes of a show, then all of a sudden I can not play back any media on any device. Method for viewing is PLe Media Server on a MAc Mini OSX 10.8.4 and PMS Version 0.9.8.7.186-0c77db1, via PLex Connect to Apple TV. I can also not playback on Web, or iOS devices. When accessing via the web portal it says the file is unavailable, but the drive is mounted and I can play back the files on the computer in quicktime and mpegstreamclip.

Must be a bug.  hopefully one of the Gurus will chime in and help us!!!!

OK, I just took a look at the Edit section for each of my media sections, and it somehow added a " 1" (space and #1) after the name of the sections directory, so a section at "/Volumes/HTPC-MEDIA/TV Shows" was showing up as "/Volumes/HTPC-MEDIA 1/TV Shows".
 
Not sure how it happened, but I changed the location back to "/Volumes/HTPC-MEDIA/TV Shows" etc and it is working correctly again.

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Thanks, I'll try it.

The OS will add a "1" to the mount point location if it tries to mount the drive and something is already mounted there.  This seems to happen most frequently when drives don't unmount cleanly upon sleep, but various other hiccups can cause it as well.

In @apt604's case, my guess is when you initially set up your sections, it was already in this state, so the sections were added with the "1" in the path, but then a restart or an unmount/remount cleaned it up so it could no longer find your sections.  @tommy29461, you probably have the opposite problem, and my guess is a restart should fix yours.

I’m away from my computer right now but before I left, I checked and mine had a 1 behind it also. I back spaced the 1 out of it but still didn’t work. I’ll try to just add the whole thing from scratch when I get home. I could have a space or something out if whack. I’ll let you know and thank you for your help!!! Also is there a better way to stop losing my external hard drive besides caffein?

I'm having the same problem as of today, though I do not have the "1" added to my sections.  Yesterday I started losing sound (loud clicking only) on my files when played back on the mac mini hosting Plex/PMC.  Inteterestingly, I can play the same files through MyPlex and the audio is fine.

OK, I just took a look at the Edit section for each of my media sections, and it somehow added a " 1" (space and #1) after the name of the sections directory, so a section at "/Volumes/HTPC-MEDIA/TV Shows" was showing up as "/Volumes/HTPC-MEDIA 1/TV Shows".
 
Not sure how it happened, but I changed the location back to "/Volumes/HTPC-MEDIA/TV Shows" etc and it is working correctly again.

This works, and I think I sidestepped the issue by simply adding both versions of the directory  (both with 1 and without 1)

I know this post is pretty old, but if anyone is still having issues I found a different reason - I was getting the error message to, but it only happened after I modified the share properties of the folder containing my movies. It was originally set to allow guests access, but not change anything - I modified it so nobody but me had access - and it blocked the TV from accessing the files. As soon as I put it back to allow guest access it worked again

Hope it helps :)

Thanks very much I found what you said worked for me can not be grateful enough Thanks once again

For me dismounting the share and remapping it to my windows server helped.

I got this error from a different problem. My 4 year old turned off the power strip to my NAS which I had to reboot. I hadn’t assigned a static IP to the NAS so I had to go back in and update all that information. Even after I did that I was having the problem. Ultimately, I figured out that I had told PLEX that the library was mapped drive Z: , but that link was broken because the IP of the NAS had changed. Once I remapped the drive and told PLEX the library was now Y: , everything worked fine.

Something similar happened to me. Checking the path and fixing it worked.

I ran into this problem when somehow the storage devices on my PC changed. The F: storage device became the G: storage device. Each bit of plex media content was assigned to some directory on the F: storage device. Well, when things went from F: to G:, this no longer worked.

But the quirky thing about the plex user interface is that you have to go to add a new piece of media content before you see the previous ones. A little weird. It is only then you can edit the current location of an existing piece of plex media content.

So I went to “add” new plex media content for each type of content, then just change F: to G:.

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