Plex wont re-install on Synology , port 34200 is use by another service

DS411 +II running DSM 6.1.2 : After successfully setting up a remote folder on my synology NAS to see another NAS on the same network, Plex scanned all the files as expected and i logged out of my synology NAS. When I tried to access the plex server from another device on the network however, the browser just sat waiting, so I logged into the NAS and found the Plex app wouldn’t open.
I uninstalled it and tried to re-install but I get a notification:
‘Port 32400 configured for this package is either used by another service or reserved for system use. Please disable or modify the conflicting service, or contact the developer to modify the package configuration.’
The Plex install fails as a result.

help?

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Just reboot your Synology.