validation is not working in form layout

 a!textField(
                                label: "Title:",
                                labelPosition: "JUSTIFIED",
                                value: local!data.requestTitle,
                                saveInto: {a!save(local!data.requestTitle, save!value) },
                                validations:(
                                if(a!isNullOrEmpty(local!data.requestTitle),
                                "Title is Required ",
                                {},
                                )),
                                
                             refreshAfter: "KEYPRESS",
                            characterLimit: 100,
                            required: true,
                        ),
                 buttons: a!buttonLayout(
                  primaryButtons: {
                    a!buttonWidget_23r3(
                      label: "Submit",
                      style: "PRIMARY",
                      submit: true,
                      saveInto: { },
                      loadingIndicator: true(),
                      validate: true(),
                    )
                  },
                  secondaryButtons: {
                    a!buttonWidget_23r3(
                      label: "Cancel",
                      style: "NORMAL",
                      submit: true,
                      validate: false,
                      value: true,
                      saveInto: ri!cancel
                    )
                  }
                )

i added validation if title field is empty then validation should display saying "title is required" but the validation is not working in above code .can someone please help