Xbox One - Playback Error 'There was a problem playing this item.' [SOLVED]

Anything i played on any server, i got this error:

Error
Playback Error

There was a problem playing this item.
[Go Home] [Retry]

Xbox Dashboard: Preview Program Build 6.2.12207.0

I’ve tried
* rebooting the server - as stated it does the same thing no matter what server im playing from
* un-installing the app on xbox
* signing out on the xbox Plex app

Plex Server Version - 0.9.12.6.1347-54c2e56

The only thing that worked for me

Unlike Xbox 360, the Xbox One does not have a menu option to clear cache on the console. Instead, follow these steps to clear cache on an Xbox One:

  • Press and hold the power button on the front of the console until it powers down completely.
  • Unplug the power cable from the back of the console so that the power brick in not connected to the console.
  • Press the power button on the console three or four times. This will ensure that any remaining power in the battery is drained, clearing the cache on the console.
  • Plug the power cable back into the console.
  • Wait for the light on the power brick to change from white to orange.
  • Turn on the console using the power button.