Call to a member function prepare() on null after adding thekordy/ticketit plugin

I have installed thekordy/ticketit plugin on laravel 5.1, done migration and added provide in config/app.php. But now when I try to run my project it shows me error as:

FatalErrorException in Connection.php line 319: Call to a member function prepare() on null

Steps followed are:

• added "kordy/ticketit": "0.*" in composer.json
• done composer update
• added provider in config/app.php

Now I just hit "http://my_url/tickets-install" url and then it shows me the error

I am using mongodb as my default database

Could someone please help me with this?

via Chebli Mohamed