Samir ZARROUK INGE-COM Project manager

I am trying to create a cabinet using REST API but I get an 404 error message.
" method \u0027Self\u0027 was not found on controller"
"Method":"POST","StatusCode":404,"Status":"Not Found"
I don't see what is wrong, my code below

List<Field> fields = new List<Field>
 {
     new Field()
     {
         DBFieldName = "NOM",
         FieldType = "Text",
         Length = 255,
         FieldLabel = "Nom",
         IsRequired = true,
     }
 };
Armoire armoire = new Armoire()
{
    Name = "My cabinet",
    Dialog = new Dialog()
    {
        DefaultResultListDialogType = "Default",
        FulltextIndexingMode = "Automatic"
    },
    Fields = fields
};

string sUri = $"{uri}/DocuWare/Platform/Organizations/FileCabinets";
 RestClientOptions rOptions = new RestClientOptions(sUri)
 {
     ThrowOnAnyError = true,
     Timeout = TimeSpan.FromSeconds(nTimeOut),
 };
 RestClient client = new RestClient(rOptions);

 RestRequest request = new RestRequest();
request.AddHeader("Content-Type", "application/json");
request.AddHeader("Accept", "application/json");
request.AddHeader("cache-Control", "no-cache");
request.AddHeader("Connection", "keep-alive");
request.AddHeader("Authorization", $"Bearer {sBearer}");
request.AddBody(armoire);

RestResponse response = client.Execute(request, Method.Post);
Console.WriteLine(response.Content);