I'm not using shards, but I keep being told that I cannot reSolve method add in agreementinfo


import com.gc.buyticket.bean.AgreementInfo;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

public class AgreementParser extends DefaultHandler {

    private AgreementInfo agreementInfo;
    private StringBuilder content = new StringBuilder();
    private List<AgreementInfo> agreementList;

    public  List<AgreementInfo> parse(InputStream in) throws IOException {

        agreementList = new ArrayList<>();
        SAXParserFactory factory = SAXParserFactory.newInstance();
        try {
            SAXParser saxParser = factory.newSAXParser();
            saxParser.parse(in,this);
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {

            e.printStackTrace();
        }
        return agreementList;
    }



    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        super.startElement(uri, localName, qName, attributes);

        if (localName.equals("agreement")){
            agreementInfo = new AgreementInfo();
            String id = attributes.getValue(0);
            agreementInfo.setId(Integer.parseInt(id));

        }
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        super.endElement(uri, localName, qName);
        if (localName.equals("xuhao")) {
            this.agreementInfo.setName(this.content.toString().trim());
        } else if (localName.equals("neirong")) {
            this.agreementInfo.setPrice(this.content.toString().trim());
        } else if (localName.equals("description")) {
            this.agreementInfo.setDescription(this.content.toString().trim());
        }else if(localName.equals("agreement")){
            this.agreementInfo.add(agreementInfo);
        }
        this.content.setLength(0);
    }
    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        super.characters(ch, start, length);
        this.content.append(ch,start,length);
    }
}