i am getting fatal error random_bytes() in laravel 5

I am getting fatal error random_bytes() in laravel 5 after installing the "paypal/adaptivepayments-sdk-php":"v3.6.106" in composer.json

"require": {
        "laravel/framework": "5.0.*",
        "jacopo/laravel-authentication-acl": "1.3.*",
        "webpatser/laravel-countries": "dev-master",
        "yajra/laravel-datatables-oracle": "~5.0",
        "illuminate/html": "5.0.*@dev",
        "paypal/adaptivepayments-sdk-php":"v3.6.106"
    },

using composer. please share me any solution . i am stuck for last 3 hrs to solve this error.

i tried to comment the nextBytes() in secureRandom.php file but i think it is not a good idea.

via Chebli Mohamed