Javafx wrong error marked

in FXML this

<ComboBox fx:id="cmbaction" layoutX="876.0" layoutY="469.0" prefHeight="23.0" prefWidth="187.0">
                  <items>
                    <FXCollections fx:factory="observableArrayList">
                      <String fx:value="1" />
                      <String fx:value="2" />

                  </items>
                  <stylesheets>
                    <URL value="@../framework/resourcesimg/Style.css" />
                  </stylesheets>
                </ComboBox>