php artisan [BadMethodCallException] Method fallback does not exist

Unable to execute any php artisan scripts.

Downgrading a laravel 5.8 installation to 5.2, and have only copied across (manually) my routes, views, and controllers.

I'm trying to run composer install which eventually calls the post-update-cmd composer script.

It fails at php artisan optimize and upon further inspection even running php artisan fails with the same error:

$ php artisan optimize


  [BadMethodCallException]
  Method fallback does not exist.

What am I missing?

Thank-you.

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