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I have looked at several answers suggested to a similar issue but nothing worked in my case. FYI, this is my first project in Laravel 7, working fine on my Mac. I have deployed the project on my server following this article . When running the project on the web, I get the following error :

Fatal error: Uncaught RuntimeException: A facade root has not been set. in /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:258

Stack trace: #0 /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(425): Illuminate\Support\Facades\Facade::__callStatic('replaceNamespac...', Array) #1 /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(402): Illuminate\Foundation\Exceptions\Handler->registerErrorViewPaths() #2 /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(313): Illuminate\Foundation\Exceptions\Handler->renderHttpException(Object(Symfony\Component\HttpKernel\Exception\HttpException)) #3 /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(210): Illuminate\Foundation\Exceptions\Handler->prepareResponse(Object(Illuminate\Http\Request), Object(Symfony\Component\HttpKernel\Exception\HttpExcepti in /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php on line 258

How can I fix it?

If the solution from @Paul Godard doesn't work, it could be a psr/log issue as mine.

My composer update added psr/log v2.0.0, which requires php8 . However, my application is on php7.4

That gave me the exact error output like in the description

Fatal error: Uncaught RuntimeException: A facade root has not been set. in /usr/www/users/utopiqwvpw/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:258
My solution was to specify in composer.json that I'm using "psr/log": "^1.1.0"
Then run composer update
        
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