Facebook Graph API: (#324) Missing or invalid image file

If you keep getting errors when trying to set a custom page tab icon when adding an app to a page – make sure that the application is actually published. You can add it – and the icon will change, but will still generate an error – if the application isn’t published yet. No idea why it’d give an error like that, but hey.

There’s quite a few other reasons for the error as well, but Google have probably already told you about those.

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