I have exactly the same problem, I've been working for 3 hours to solve it, but can't figure out how to solve it. If you found a solution, please share your answer, I will do the same.

If anyone else can help us, it would be appreciated.

Thanks! It worked for me too. Somehow it was removed from that autoload file. Now I can continue. :)

My problem cant be resolved by adding the above code!

I resolve the problem by copy the LogServiceProvider Class from an old vendor directory installarion. The problem occours whem I install a fresh new installation of Laravel. It seems like the "LogServiceProvider" Class is not avaliable in Laravel 5 new installations. BUG? Please, correct me if I am wrong.

This is the file that I copied from my old Laravel 5 installation: vendor/laravel/frameword/src/Illuminate/Log/

<?php namespace Illuminate\Log;

use Monolog\Logger;
use Illuminate\Support\ServiceProvider;

class LogServiceProvider extends ServiceProvider {

    /**
     * Indicates if loading of the provider is deferred.
     *
     * @var bool
     */
    protected $defer = true;

    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->app->instance(
            'log', new Writer(new Logger($this->app['env']), $this->app['events'])
        );

        $this->app->bind('Psr\Log\LoggerInterface', function()
        {
            return $this->app['log']->getMonolog();
        });
    }

    /**
     * Get the services provided by the provider.
     *
     * @return array
     */
    public function provides()
    {
        return ['log', 'Psr\Log\LoggerInterface'];
    }

}

The solution was install a fresh new installation again. Like Graham Campbell says in the follow link:

https://github.com/laravel/framework/issues/6310

I faced a similar problem, Uploading the vendor/composer folder to the server worked for me !

@aabid01 I had the same problem, and uploading composer folder again did the trick! Thanks!