Hello. Recheck your database connection settings. You can check them with your hosting provider.
Temporarily disable your antivirus and firewall.

Thanks Aleksej,  I do  not know what to check. The Cpanel hosting has 

MySQL® DatabasesChecking Database

Database “actnowor_wp506” is now being checked.  and everything is reported ok (the site is actnow.org.in)

and the error says : MySQL Database settings (blog) - why blog?

"I do not know what to check." - You need to double check these settings:

Ore go here:

You can disable adding comments to the database.