im getting the error message "Incompatible types - found Volunteer but
expected java.lang.String" why is this. the error occurs in the
assignPerson method below.

public class Person
{
    // instance variables
    public String name;
    public String address;
    public int telephone;
    public boolean withVolunteer;
    public String volunteer;
   
    public Person (String name, String address, int telephone)
    {
       this.name = name;
       this.address = address;
       this.telephone = telephone;
    }

    /**
    * Method to get the persons name.
    * @return     name
    */
    public String getName()
    {
        return name;
    }
   
    /**
    * Method to get a persons information.
    *
    * @return     name, address, telephone
    */
    public String getDescription()
    {
       return name + "\t" + address + "\t" + telephone;
    }
   
    public void assignPerson(Volunteer volunteer)
    {
       withVolunteer = true;
       this.volunteer = volunteer; //ERROR
    }
   
       
       
}