Can't use plex on my Synology NAS DS214+

Hi,
It is the first time I try to install a plex media server, so I am completely new with it.
I have a Synology DS214+ and I installed the ARMV7 plex.
My NAS is running DSM 6.0.2-8451 Update 9.
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The problem I encounter is when I click on the URL link I get and error message :
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I tried to reinstall plex several times but it still don't work.
If you know any solution to my problem I would be pleased to know it.