No Role found for signer email

Hi, i'm gettin this error message "OneSpanSign.Sdk.OssException: 'No Role found for signer email ", creating a package, this is the code that i'm using, thanks for the help.

 String API_KEY = "dzkxxxljQw==";
            String CLIENT_APP_ID = "17bbxxx338b";
            String CLIENT_APP_SECRET = "687964xxx79118c29";
            String BASE_API_URL = "https://sandbox.esignlive.com";    
            String API_URL = BASE_API_URL + "/api";
          

             OssClient ossClient = new OssClient(new ApiTokenConfig
               {
                   ClientAppId = CLIENT_APP_ID,
                   ClientAppSecret = CLIENT_APP_SECRET,
                   BaseUrl = BASE_API_URL,
                   TokenType = ApiTokenType.OWNER
               },
              BASE_API_URL + "/api", false, null, new Dictionary<string, string>());

            List<InfoFirma> LstFirmantes = new List<InfoFirma>();

            LstFirmantes.Add(new InfoFirma { Nombre = "xx", Apellido = "xx", Correo = "[email protected]" });
            LstFirmantes.Add(new InfoFirma { Nombre = "xx", Apellido = "xx", Correo = "[email protected]" });

            PackageBuilder objPaquete = PackageBuilder.NewPackageNamed("Test desde Visual").DescribedAs("Descripcion del Paquete")
                .WithSettings(DocumentPackageSettingsBuilder.NewDocumentPackageSettings());

            objPaquete.WithSigner(SignerBuilder.NewSignerWithEmail("[email protected]").WithFirstName("xx").WithLastName("xx").WithCustomId("Signer1"));            
            objPaquete.WithSigner(SignerBuilder.NewSignerWithEmail("[email protected]").WithFirstName("xx").WithLastName("xx").WithCustomId("Signer2"));

            DocumentBuilder objDocumento = DocumentBuilder.NewDocumentNamed("Tipo Documento Ejemplo Firma.");
            FileStream ArchivoStream = File.OpenRead("../Diploma.pdf");

            objDocumento.FromStream(ArchivoStream, DocumentType.PDF);
            objDocumento.WithSignature(SignatureBuilder.SignatureFor("[email protected]").OnPage(0).AtPosition(175, 165));
            objDocumento.WithSignature(SignatureBuilder.SignatureFor("[email protected]").OnPage(0).AtPosition(550, 165).Build());

            objPaquete.WithDocument(objDocumento.Build());
            
            PackageId idPaquete = ossClient.CreatePackageOneStep(objPaquete.Build());
            ossClient.SendPackage(idPaquete);
            Console.WriteLine($"Id de Paquete: "+idPaquete.Id);