Module site.php not found

Fatal error: Uncaught exception 'ModuleNotFound' with message 'Module site.php not found' in /var/www/vhosts/m/lib/Module.php:76
Stack trace:
#0 /var/www/vhosts/m/lib/WebModule.php(363): factory(string, string)
#1 /var/www/vhosts/m/www/index.php(270): factory(string, string, array)
#2 {main}
thrown in /var/www/vhosts/m/lib/Module.php on line 76

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