Did you upload your entire vendor dir?

Take a look at this here

Also, did you do a

php composer.phar update

Make sure you delete the composer.lock file first, then update composer, upload to your server and see what happens.

barryvdh said:

Did you upload your entire vendor dir?

Yes.

Well you seem to be missing some files. Maybe run composer dump-autoload or indeed just composer install

swgj19 said:

Take a look at this here

Also, did you do a

php composer.phar update

Make sure you delete the composer.lock file first, then update composer, upload to your server and see what happens.

I do it. Now I have this error: Fatal error: Interface 'Symfony\Component\HttpKernel\HttpKernelInterface' not found in /web/htdocs/www.liguria-eventi.it/home/vendor/laravel/framework/src/Illuminate/Foundation/Application.php on line 23

I noticed in the vendor folder that all subfolders are like this

 symfony\component\httpkernel\

and not

Symfony\Component\HttpKernel