A manual page that lists all the errors the platform can generate, and what they mean, would be useful.

Any news about this?

Especially, documentation about errors not specific to a request, such as time-outs in the client, and the script execution time-out error.

Hey,

Those are fine for describing errors for specific requests (though a short example of the general error format could be useful for beginners).. But there are also more general errors that I haven't come across in the docs, such as 'script execution timeout error' in cloud scripts, or ClientError/timeout on the client side. 

There do seem to be a number of undocumented codes. For example, FacebookConnectRequest gives "response.Errors.JSON: {"FACEBOOK":"NOT_CONFIGURED"}" when I've not got Facebook set up in my project, which is fine - I would expect an error like this, but it's not here: https://api.gamesparks.net/#facebookconnectrequest