ReSmush.It Error

Recently started receiving the following error when accessing certain parts of my webpage:

Warning: require(resmushit.settings.php): failed to open stream: No such file or directory in resmushit.inc.php on line 3

Fatal error: require(): Failed opening required ‘resmushit.settings.php’ (include_path=’.’) in resmushit.inc.php on line 3

Also noticed that the Resmush.it website (https://resmush.it/) appears to be down.

Is there a problem with Resmush.it currently or is this isolated to my webpage? Any recommended fixes?