facebook ERR

All invite pop up screens from widget is working ok, except on fb invite (https://www.facebook.com/dialog/send?app_id=&display=popup&e2e=%7B%7D&link=http%3A%2F%2Fsmeak.com%2Fpeople%2F&locale=en_US&next=http%3A%2F%2Fstatic.ak.facebook.com%2Fconnect%2Fxd_arbiter%2FFX-Xf5fQjUk.js%3Fversion%3D41%23cb%3Df1543ec0ac%26domain%3Dsmeak.com%26origin%3Dhttp%253A%252F%252Fsmeak.com%252Ff26f8d68a4%26relation%3Dopener%26frame%3Df24e38d75%26result%3D%2522xxRESULTTOKENxx%2522&sdk=joey)

I get a fb error page in modal with Error and red box saying “An error occured. Please try later” Have checked settings in fb all seems fine

https://ww.wp.xz.cn/plugins/wp-social-invitations/