Refused to display 'https://ll-testing-shop.myshopify.com/admin/apps' in a frame because it set

[ll_test]

After submiting one of my apps(InstaCom) for review it got rejected ,I have done all the changes in app listing and updated GDPR webhooks. But after installing my app in development store it does not open ang gives a error message as "Refused to display 'https://ll-testing-shop.myshopify.com/admin/apps' in a frame because it set 'X-Frame-Options' to 'deny'." I have not any done any changes in the app code .Previously before submiting the app for review it was working properly. Please help me!