'Cache' object has no attribute 'create_slug'

[ParmarChandan]

I get this error when I try to create a blog using editor page.
I am entering the title as "Hello" and the body as "This is my first test", Tag as "Initial". I have tried with various other values but it doesnt work, I am running this code on my dev server with url http://127.0.0.1:5000

exact error is in the following line of code:
slug = post_processor.create_slug(form.title.data)

and file: lib\site-packages\flask_blogging\views.py", line 249, in editor