Error Message in Debug.log

I received this error message in my debug file several times morning (78 to be exact) and wanted to know how bad of an error this could turn out to be:

[24-Apr-2019 04:58:09 UTC] PHP Fatal error: require_once(): Failed opening required ‘C:\inetpub\wwwroot\wordpress\wp-content\plugins\updraftplus/methods/addon-base-v2.php’ (include_path=’.;C:\php\pear’) in C:\inetpub\wwwroot\wordpress\wp-content\plugins\updraftplus\addons\sftp.php on line 14

My website has not crashed or anything like that,but with it being a fatal error I have disabled the plugin for the time being. I just want to stay on top of my debug and know what this error message means so when my boss asks me about I have a good idea of why this happened.