How Do I Upload Video To Flow Player Drive Using Flow Player Api

See more:

C#

ASP.NET

WebAPI

I write the code to post the video into my flow player account but i am getting an error saying that

<pre lang="c#">System.Net.WebException: The remote server returned an error: (500) Internal Server Error.
at System.Net.HttpWebRequest.GetResponse()

Below is the my code Please suggest me the changes to upload video to my flow player account

try
{
string data = "";
User PostVideo = new User();
//PostVideo.authcode = ObjUser.authcode;
PostVideo.SourceURL = (Server.MapPath("~/" + lblVideoFilePath.Text.ToString()));
PostVideo.free = true;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://drive.api.flowplayer.org/jobs");
WebHeaderCollection myWebHeaderCollection = request.Headers;
myWebHeaderCollection.Add("flowplayer-authcode", ObjUser.authcode);
request.Method = "POST";
request.ContentType = "application/json";
var userSerialized = JsonConvert.SerializeObject(PostVideo); // <— This is JSON.NET; it works (userSerialized has the JSONized versiono of the User object created above)
using (StreamWriter sw = new StreamWriter(request.GetRequestStream()))
{
sw.Write(userSerialized);
sw.Flush();
}
using (var httpWebResponse = request.GetResponse() as HttpWebResponse)
{
if (httpWebResponse != null)
{
using (var streamReader = new StreamReader(httpWebResponse.GetResponseStream()))
{
data = streamReader.ReadToEnd();
}
}
return data;
}
}
catch (Exception e)
{
Response.Write(e);
return "";
}

the Source URL is :
D:\MyWebsite\WebSite\Resources\Videos\whatisxmlindotnet-34382b2e-d1d3- 447b-bf71-0f190e231fbf.mp4

Please help me...!
here is a link to the API documentation that i am using
Drive API documentation[^]