The “Oops! Something went wrong” error shows up when you haven’t set a browser API key on the settings page, or when something isn’t configured correctly for the key you are using in the Google Developers Console.
If you did set the browser API key, then you can read more on how to debug the problem here.
It’s also important that you created the key through the “Create Browser Key” button in this article. If you didn’t, then it’s likely that not all the required map API’s are enabled, resulting in errors.
The easiest way to fix this is by deleting the old key and creating a new one through this link.