Can’t extend Ultimate theme login page

Laraship QuestionsCategory: TechnicalCan’t extend Ultimate theme login page
tech asked 4 years ago
Step to reproduce. Following documentation Theme.json:
"type": "frontend",
"name": "ultimatum",
"extends": "corals-ecommerce-ultimate",
"caption": "Ultimatum",
"version": "1.0",
"assetPath": "assets\/themes\/ultimatum"
Works fine so far. Now, for instance even copying the same auth/login.blade.php into the new theme. Visit: http://localhost/login and error is thrown. ErrorException (E_ERROR) Object of class Illuminate\Routing\UrlGenerator could not be converted to string (View: /home/vagrant/PUB/resources/themes/ecommerce-ultimate/layouts/auth.blade.php)
Symfony\Component\Debug\Exception\FatalThrowableError /Corals/core/Theme/Themes.php 394 .  Thanks in advance