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Can't Load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.
the app domain is your domain name. Before you enter your domain, first click on Add Platform, select website, enter your site URL and mobile site url. Save the settings. Thereafter, you can enter the domain name in the App domains field.
1 - Click Apps and then select your app.
2 - Click the Settings button on the left side of the screen.
3 - In the Basic settings, click the Add Platform button below the settings configuration.
4 -Select Website in the platform dialog.
5 - Enter your URL (localhost works here).
6 - In the App Domains text input, add your domain that matches the one in the URL.
7 - Save your settings.
Check this link for detail
You need to add the platform (website, facebook web games, android, etc.) your app is running on first. See The explanation from Facebook
Add localhost under the Website > Site URL save and then add localhost in the App domain.
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