Please note that, the error is not showing on front-end anywhere. Even before you updated theme, it was not showing. It is there in
php_errorlog file in the website root.
The main error reported in 1st post is still there. I deleted php_errorlog file and then tried to access website. On accessing website multiple times, the error repeated. Please check error in private area.
There is another error in Statistics tool which I mentioned in private area below main error.
This field is Private Content.
