Invalid App Id: Must be a number or numeric string representing the application id.|Tweet Like Plusone and Share Plugin|Plugin Support Forum|TECHXT

I installed this app on my wordpress site but I am getting error on my console:

"Invalid App Id: Must be a number or numeric string representing the application id."

The widget is displayed on my page but it is nothing happens after clicking any of the buttons. It's my first time creating a website and using a widget like this and upon researching someone mentions that I have to supply the app id of facebook in order for it to work but I don't know where should I place it. I think this app is good but I think some detailed documentation needs to be done here in order for someone like a newbie like me to use it. I hope someone can help me. Thanks