Error-response.md

+All requests get this kind of error response:
+
+
+    {
+      "error": {
+        "id": "example-1",
+        "message": "Some weird error",
+        "description": "Don't worry, this is an example ;-)",
+        "whatnext": "",
+        "statuscode": 403
+      }
+    }
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