I am sorry, I read your msg late. I converted my Storage volume type of UFS and it fixed my problem.
For other users who are facing same problem.
Only thing I had to create data-sets manually via Shell.
Example
mkdir pluginsjails
mkdir mymedia
and
chmod -R 757 pluginsjails
chmod -R 757 mymedia
Hope it helps...
I would still like to feedback why I installation isn't successful when I use ZFS type.