JetPack handles the "Like" button. I disabled the JetPack module and tried to re-enable it. Got the following error. I have been troubling shooting for a few hours but I have no resolution. I am not sure what's causing the issue but it's definitely isolated to JetPack.

Error Details: The Jetpack server could not communicate with your site's XML-RPC URL. Please check to make sure http://174.138.50.14/xmlrpc.php is working properly.

It should show 'XML-RPC server accepts POST requests only.' on a line by itself when viewed in a browser and should not have any blank lines or extra output anywhere.

Find out how to fix this issue here: https://jetpack.com/support/getting-started-with-jetpack/what-do-these-error-messages-mean/blank-lines-xmlrpc/