Error after PHP upgrade

  • After upgrading my site to PHP 8.1 from 8.0, the WordPress dashboard now shows the following error:

    Deprecated: is_dir(): Passing null to parameter #1 ($filename) of type string is deprecated in /chroot/home/ace3b3a5/f0691d1627.nxcli.io/html/wp-content/mu-plugins/nexcess-mapps/vendor/keycdn/cache-enabler/inc/cache_enabler_disk.class.php

    My host is Nexcess. Is this the kind of error that needs to be fixed by Nexcess or KeyCDN?

    The page I need help with: [log in to see the link]

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