Error in exception handler. - Laravel

The safer option would be to change the group of the storage directories to your web servers group (usually apache or www-data, but this can vary between the different operating systems) and keep the permissions as of the directory as 775.

chgrp -R www-data app/storage

Or with chown.

chown -R :www-data app/storage

Then make sure directory permissions are 775.

chmod -R 775 app/storage

From the Laravel web site:

Laravel may require one set of permissions to be configured: folders within app/storage require write access by the web server.

Laravel 5.2

chmod -R 777 storage

Older Laravelchmod 777 app/storage/*

Note if you've got a reasonably locked down dedicated server with no user accounts other than your own, 777 shouldn't pose any more security risk than anything else. There'd have to be some other vulnerability for a malicious user to take advantage of that, and at that point, the 777 permission is probably moot anyway. If however you are on a shared server with other users you do not trust, then you'll need to look into more complicated permissions or check if your hosting provider has already provided isolation.

They should really put this in the quick start docs and provide examples for various setups. You may also have to run it again after the first load as more directories are created automatically. Look in your logs for write errors.

Also your DocumentRoot should be /path/to/laravel-project/public

I deleted old sessions inside app/storage/sessions folder and give a 775 permission to app/storage after that it's working like a fire!

chmod -R 775 app/storage

Good luck!