Unable to delete file on Plex server from Web interface

[JuiceWSA]

That sounds like what happens when Plex is indexing an item when another scan is initiated… or something like that.

Plex Dance those ‘Dual’ items (there’s probably only one physical version) and see if that fixes them:

The Plex Dance ™

The purpose of this is to remove all cached metadata and xml data for an item that Plex usually keeps. This helps when you want to “start from scratch” for particular item move all files for the media item out of the directory your Library is looking at, so Plex will not “see” it anymore scan the library library (to detect changes) empty trash clean bundles (in menu next to server name, when accessed under ‘More’) double check naming schema and move files back scan the library Support articl…

ALL Steps
IN ORDER
or it simply won’t work.