Gutenberg does not work with the plugin.

The Classic Editor plugin version 1.0 is meant to be used in WordPress 5.0. It manages the new “Block Editor” there.

If you want to test new features in Gutenberg in WordPress 5.0, you can install it, but it is not needed to use the new Block Editor.

I use WP 5.0 Beta.

I believe this is resolved in 1.2? ??