CSharp SDK dbx.Files.UploadAsync doesn't work

Thanks Qiming, with a slight adjustment to that, the errors are now indeed throwing properly, I'll put my main function here and then the errors:

static void Main(string[] args)

{

    var task = Task.Run((Func<Task>)Program.Run);

    task.Wait();

}

static async Task Run()

{

    CIPostBuildTask postBuild = new CIPostBuildTask();

    await postBuild.Run();

}

The following line (which I added to my first post in a try-catch), shows the error that follows:

var full = await dbx.Users.GetCurrentAccountAsync();

ERROR: Error in call to API function "users/get_current_account": The given OAuth 2 access token is malformed.

In addition, the following line throws the following error in it's try-catch statement:

var updated = await dbx.Files.UploadAsync(

    folder + "/" + file,

    WriteMode.Overwrite.Instance,

    body: mem);

ERROR: Error in call to API function "files/upload": The given OAuth 2 access token is malformed.