[For 1.6] MyShowcase System 2.5.2

[TheNova]

Whenever I try to create a table for a showcase I've created it keeps saying:

"Access to this resource on the server is denied!"

I click options beside the existing showcases, I click create table and the above is what I get. The status also shows a red exclamation image, even though when I click Enable, it says it was successfully enabled.

I've enabled the showcase and even when I try adding new field sets it still says the language file is not writeable, even though I set it to 777.