Fatal error: require_once(): […]

Hi !

When I try to update the Arcade theme (I delete the old version, then I upload the new version), I get this error message:

Warning: require_once(/homepages/3/d627522336/htdocs/wp-content/plugins/arcane_custom_post_types/smartmetabox/SmartMetaBox.php): failed to open stream: No such file or directory in /homepages/3/d627522336/htdocs/wp-content/themes/arcane/arcane/functions.php on line 14

Fatal error: require_once(): Failed opening required ‘/homepages/3/d627522336/htdocs/wp-content/plugins/arcane_custom_post_types/smartmetabox/SmartMetaBox.php’ (include_path=’.:/usr/lib/php7.1′) in /homepages/3/d627522336/htdocs/wp-content/themes/arcane/arcane/functions.php on line 14

When I get this error, my site becomes completely inaccessible.