Fatal error: Uncaught CurlException: 7 in base_Facebook.php on line 967-Collection of common programming errors

I just follow same code from here

I’m getting this error frequently today. I’ve googled it but couldn’t figure out exactly what’s the root of the problem. Could be my host? Could be Facebook?

Fatal error: Uncaught CurlException: 7: Failed to connect to 2a03:2880:20:3f07:face:b00c:0:1: Network is unreachable thrown in ../folder/application/libraries/facebook/base_facebook.php on line 967