WordPress informs that "This site is no longer available."

I use the Pro Site plugin together with the WHMCS MU PROVISIONING Plugin. My client's site has been disabled for non-payment. I have now reactivated the client's site, but when I try to access the site WordPress informs that "This site is no longer available."

When I access the administration area of my network the site is active again.

I can usually access the control panel after reactivation.
I can access other pages of the site, but the initial page continues with the message "This site is no longer available."

Please access the link below:
http://camila.petsnaweb.com/
http://camila.petsnaweb.com/blog/

Please help me solve this.

Abs,
Josimar