Call to a member function getDomain() on null

[kiran-tech]

hello members,

I am trying to create shopify app with laravel.i am beginner of shopify app development and I am using shopify partner account.i followed reference url https://weeklyhow.com/shopify-app-development-with-laravel/ and https://github.com/osiset/laravel-shopify/wiki/Installation .after follow all the steps as per given url,I got the error Call to a member function getDomain() on null.first I run on localhost.so I my app url was http://127.0.0.1:8000/.i tried every possible solution for this error.then I through may be this error occurred because of localhost.so I tried this on live web serve also.but still I am getting this error.is this error because of Authentication problem?I got shop ,hmac and timestamp in url perfectly.and please help me to get out of this error.

thank you.