How to make Greggilbert\Recaptcha work?

Question

Laravel

Hello. Installed the Greggilbert\Recaptcha package to implement recaptcha on laravel 5.2. I did everything according to the instructions , but I get an error:
array_merge(): Argument #1 is not an array
Although, the captcha output can be without parameters, as a matter of fact, and I use it:
{!! Recaptcha::render() !!}
Please tell me where I could make a mistake and how to make this package work?