One or more errors occurred.System.NullReferenceException: Object reference not set to an instance of an object. at System.Net.Http.Headers.HttpHeaderParser.ToString(Object value) at System.Net.Http.Headers.HttpHeaders.ReadStoreValues[T](String[] values, Object storeValue, HttpHeaderParser parser, T exclude, Int32& currentIndex) at System.Net.Http.Headers.HttpHeaders.GetValuesAsStrings(HeaderStoreItemInfo info, Object exclude) at System.Net.Http.Headers.HttpHeaders.GetHeaderString(HeaderStoreItemInfo info, Object exclude) at System.Net.Http.Headers.HttpHeaders.d__15.MoveNext() at System.Net.Http.HttpClientHandler.SetRequestHeaders(HttpWebRequest webRequest, HttpRequestMessage request) at System.Net.Http.HttpClientHandler.CreateAndPrepareWebRequest(HttpRequestMessage request) at System.Net.Http.HttpClientHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) [Cod-005]