Facebook shares’ number not displayed

We have a website with more than 15.000 articles and we really would like to be able to use your plugin with best results. For now, the number of Facebook shares is not displayed. https://semneletimpului.ro. I have tried to figure out what the problem is. I got this error message: OAuth “Facebook Platform” “invalid_request” “(#4) Application request limit reached. Please, can you help in making the plugin fully functional on our website? (I have sent you also an email to [email protected]). Thank you.