SimpleLikes plugin error on Postbit

I'm facing a problem with adding the callback for the total likes received by a user on the postbit.
I've referred to this thread for the template code: 
But I still failed. It used to work but after moving hosts, it doesn't anymore for some unknown reason.

I would be glad if anyone could solve this for me.

Thank you.

Would you mind sending me a URL and details for an admin account so I can take a look?