The type com.vaadin.terminal.ErrorMessage cannot be resolved

General
1

I have this code:

package eu.relsys.vdma.vaadin.ui.Selector;

import org.vaadin.addon.customfield.CustomField;

import com.vaadin.addon.jpacontainer.JPAContainer;
import com.vaadin.addon.jpacontainer.JPAContainerFactory;
import com.vaadin.data.Property;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.CssLayout;

import eu.relsys.vdma.vaadin.MyVaadinApplication;
import eu.relsys.vdma.vaadin.domain.Country;

public class CountrySelector extends CustomField {

    private ComboBox country = new ComboBox();
    private JPAContainer<Country> container;

    public CountrySelector() {
        container = JPAContainerFactory.make(Country.class,
                MyVaadinApplication.PERSISTENCE_UNIT);
        setCaption("Country");

        container.setApplyFiltersImmediately(false);
        country.setContainerDataSource(container);
        country.setItemCaptionPropertyId("name");

        country.addListener(new Property.ValueChangeListener() {
            @Override
            public void valueChange(
                    com.vaadin.data.Property.ValueChangeEvent event) {
                /*
                 * Modify the actual value of the custom field.
                 */
                if (country.getValue() == null) {
                    setValue(null, false);
                } else {
                	Country entity = container
                            .getItem(country.getValue()).getEntity();
                    setValue(entity, false);
                }
            }
        });

        CssLayout cssLayout = new CssLayout();
        cssLayout.addComponent(country);
        setCompositionRoot(cssLayout);
    }

    @Override
    public void setPropertyDataSource(Property newDataSource) {
        super.setPropertyDataSource(newDataSource);
        setDepartment(newDataSource.getValue());
    }

    @Override
    public void setValue(Object newValue) throws ReadOnlyException {
        setDepartment(newValue);
    }

    private void setDepartment(Object newValue) {
    	Country value = (Country) newValue;
        country.setValue(value != null ? value.getId() : null);
    }

    @Override
    public Class<?> getType() {
        return Country.class;
    }
}

Eclipse says:

The type com.vaadin.terminal.ErrorMessage cannot be resolved. It is indirectly referenced from required .class files