C++ UWP (target platform version 10.0.17134.0) - Error on uploading a photo

[HoaLeMinh]

Hi All,

I tried the Login and Logout functions and they work properly. However when I try to upload a photo (calling FBSingleValue::PostAsync()), the request seems not sending to the Facebook server. I have to debug the source code instead of using it from the nuget. And the error, I see, is:

WinRT originate error - 0x83750007 : ''input': Value must not be empty.'

I search the error code and it says:

5566, 2205483015, 0x83750007, Web, WEB_E_INVALID_JSON_STRING, "Invalid JSON string."

The URI looks correctly:

https://graph.facebook.com/v2.6/102512017422178/photos?access_token=EAAIB5zlOpHgBAMonCsCW84e7FGNs0rhELcx14idG5SuKQs7uwUUl2HeV2TUbj9uT1zhMS1lpxQzXYBIllQ1Pp8jXPvNZCUKKEtjr9gEZAn2nC0HDXr1FfmaQV2yb6FUVAOZCZBefhf2fETlbrIew1CLcrIedjJxFpKhkW25W7ZAKOpDzoIGPz

I appreciate very much if you already experienced this issue and help me to solve it.

Regards, Hoa.