Search for places with an App Access Token suddenly stopped working

i am calling the graph API with an App Access token (grant_type=client_credentials) to search for places on facebook. Quering for

https://graph.facebook.com/search?type=place&center=50.785361,6.0334127

Used return the search result reliably but suddenly stopped working with the following error:

{
  "error": {
    "message": "An unknown error has occurred.", 
    "type": "OAuthException", 
    "code": 1
  }
}

I have tested the call on the Graph API Explorer. With my facebook user's access token the request still returns the desired data. Other requests with this app access token still work, so the token is good.

Any ideas?

链接地址: http://www.djcxy.com/p/70382.html

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