Nothing happened on WP dashboard

Hi There, 

I have sent this to support team but they can’t help.
and I’m no ideas now.

I already installed an unbounce plugin onto my wp site.
but nothing happen when I clicked the tab. { see attached }

Moreover, I did these on my sub domain that it’s working fine.
with the same website structure and PHP version.

If anyone who have/had this issue, please kindly advise.

Thank you so much