Not showing map

I have installed and configured the plugin , I have connected with Google Api but when I enter in Route planner, The map is not showing and there is a windows where there is this text “This page is unable to load Google maps correctly. Are you the owner of this website?” I am the owner of the website and also verified by google. I have passed last 2 days trying to understand the problem but I am only going mad. Can you halp me?