Update to Drupal 8.0.2. For more information, see https://www.drupal.org/drupal-8.0.2-release-notes

core/lib/Drupal/Component/Utility/OpCodeCache.php

@@ -30,16 +30,6 @@ class OpCodeCache {
     if (function_exists('opcache_invalidate')) {
       opcache_invalidate($pathname, TRUE);
     }
-    // If apcu extension is enabled in PHP 5.5 or greater it emulates apc.
-    // This is to provide an easy upgrade path if you are using apc's user
-    // caching however the emulation does not extend to opcode caching.
-    // Therefore we need to check if the function exists as well.
-    if (extension_loaded('apc') && function_exists('apc_delete_file')) {
-      // apc_delete_file() throws a PHP warning in case the specified file was
-      // not compiled yet.
-      // @see http://php.net/manual/en/function.apc-delete-file.php
-      @apc_delete_file($pathname);
-    }
   }
 
 }