Cannot modify apps on Facebook - facebook-apps

I create this topic because when I try to modify my facebook apps, I constantly get the following error :
Oops Something went wrong. We're working on getting this fixed as soon as we can. You may be able to try again.
I tried in Firefox and Internet Explorer to check if the problem was coming from my web-browser, and then I checked from a friends station, but I still get this error.
Just wanted to know if someone else had this problem ? Maybe I have to do something from my side ? Or can I just wait for Facebook team to solve this ?
Thank you in advance.
Bahan

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Google OAuth2 Demo fails with 403 ["message": "Cannot determine user location for geographically restricted operation."]

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How to fix Feature not enabled problems

I currently have an issue that whenever I connect my MapBox map to the Directions API, an error is returned which says '{"message":"Feature not enabled"}'.
I have looked around and have not found anywhere where I can enable this feature, and would like to know if there is a way that you can do it.
Thanks in Advance,
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https://www.mapbox.com/developers/api/directions/
First line:
This API is a preview and may be changed or removed at any time. Contact us to get testing access to this API.