To provide more specific information here. After I got error as stated in previous thread I tired to reinstall WordPress by deleting previous installation and fresh database.
And it was observed by me that if “WP Hide & Security Enhancer” is not installed and security setting not done then I do not get any error of Ajax. Even in Tools, status of Admin Ajax is Accessible.
With this I hope Give is giving error when security Harding is done with WP Hide & Security Enhancer.