Can't install

I get this error when i open the site. 

Call to a member function customer() on null (View: B:\xampp\htdocs\Akaunting\resources\views\layouts\admin.blade.php) (View: B:\xampp\htdocs\Akaunting\resources\views\layouts\admin.blade.php)

<p>I get this error when i open the site. </p><br /> <p><span style="color: #222222; font-family: Helvetica, Arial, sans-serif; background-color: #e0e0e0;">Call to a member function customer() on null (View: B:\xampp\htdocs\Akaunting\resources\views\layouts\admin.blade.php) (View: B:\xampp\htdocs\Akaunting\resources\views\layouts\admin.blade.php)</span></p>

How do you open the site? Check the instructions https://akaunting.com/docs/installation

<p>How do you open the site? Check the instructions https://akaunting.com/docs/installation</p>