Array to string conversion Laravel 5.1

Hi I have cloned laravel 5.1 project from git and setup all things as required.

now I am trhying to run any command Like

php artisan key:generate

or

php artisan migrate

I am getting following error.

Array to string conversion

I search much about it, but could not get fixed. Please assist what could be the issue in this.

Thanks in advance

via Chebli Mohamed