Freenas 9.3 jails unable to find template

New on the forums!
So i just installed 9.3, i have used 9.2 for some time but due to new apartment i have not been using my server for some time. So i did a fresh install and wanted to install some plugins, Plex for example.
I made a dataset for plugins, set the directory for plugins to my dataset.
but when i try to install a plugin i get an error. [unable to find template]
So i don't fully understand what the problem is, but i understand it is something with creating a jail, tried creating a jail but did not work.

Im using the ASRock C2750D4I with 16 gb ecc memory, with 4 three tb drives in raidZ.

very thankful for any help!