Logged In users cannot create site

I recently figured out that the registered users who has not created site earlier, when tried to create a new site. "Invalid page", error message displayed.

I am not sure if some settings of the site has been modified, I have never seen this error before.

Please let me know can I make it available for my registered users to create a site.

For further communication please refer to the forum post:
https://premium.wpmudev.org/forums/topic/logged-in-users-cannot-create-site#post-853171