Cannot access website – error message

Hi,

I have a website I haven’t accessed for some weeks. Last time I did, it loaded without any problem. When I click on the browser link to the site I get an error message:

“TypeError thrown

“Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned”Return value of Composer\Autoload\ClassLoader::initializeIncludeClosure() must be an instance of Composer\Autoload\void, none returned”

I can’t get into the website as a viewer, and I also can’t get into my wp-login page to access my wp page files to see what’s wrong or to update any plugins. Updates of plugins are supposed to be automatic, but come to think of it, I have received no emails lately about automatic updates.