Can't specify SQLite as a database in Laravel

Whenever I run php artisan migrate, the following error is shown in the console:

[PDOException]
SQLSTATE[HY000] [14] unable to open database file

The database.sqlite file is located at database/. I'm running Windows 10, Laravel 5.2. Here are my configurations:

.env:

DB_CONNECTION=sqlite
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=database
DB_USERNAME=homestead
DB_PASSWORD=secret

I have looked everywhere, but could not find what causes this error and how to resolve it.