JAILS, PLEX: The path '/mnt/datastore1' requires execute permission bit

Hi,
I am trying to use Plex on my FreeNAS 9.1.1

When I try to configure the Plex Jails Storage, I get the following Message:

The path '/mnt/datastore1' requires execute permission bit

See the screenshot.

The error stays the same when choosin
Source: /mnt/Plex/media
Destination: /media

When I choosed Source and Destionation, I get also this message:

Select a valid choice. plex_1 is not one of the available choices.

What should I do to get plex working?

I used this tutorial to get...

JAILS, PLEX: The path '/mnt/datastore1' requires execute permission bit