JESS Exception: expected method name

I use Jess and Java and I want to call a Java function inside a Jess rule but when I launch my code I have this message :

Here is the code :

// Create a Jess rule engine
    ENGINE.reset();

    // Load the rules and the templates

    //TEMPLATES
    ENGINE.eval("(deftemplate Light (declare (from-class ro.domoticbot.data.Light)))");
    ENGINE.eval("(deftemplate Door (declare (from-class ro.domoticbot.data.Door)))");

    //RULES
    ENGINE.eval("(defrule switch-light \"rule to switch light state\" (Light {lightOn == FALSE}) => "
            + "(call flip)(printout t \"the lamp is on\" crlf))");

    ENGINE.eval("(defrule open-door \"rule to open a door\" (Door {open == FALSE}) => "
            + "(call flip)(printout t \"the door is open\" crlf))");

Here are the two classes Door and Light :

public class Door implements Programmable, Serializable{

private static final long serialVersionUID = 1L;
private boolean open = false;
private final Map<Integer, List<Timeslot>> timeslots = new HashMap<>();
private final String name;

public Door(String name) {
    this.name = Objects.requireNonNull(name);
}

/**
 * Change the state of the door (open / close)
 * Return the new state
 */
@Override
public void flip() {
    this.open = !this.open;
}

public boolean getOpen() {
    return open;
}


public class Light implements Programmable, Serializable {

private static final long serialVersionUID = 1L;
private boolean lightOn = false;
private final Map<Integer, List<Timeslot>> timeslots = new HashMap<>();
private final String name;

public Light(String name) {
    this.name = Objects.requireNonNull(name);
}

/**
 * Change the state of the light (light on/off).
 */
@Override
public void flip() {
    this.lightOn = !this.lightOn;
}

public boolean getLightOn() {
    return lightOn;
}

I want to call the function flip() inside the rules but this method is defined in the classes Light and Door. Thank you.

The first argument to “call” is either the object to call the method on, or the name of a class for a static method. Bind the Door object to a variable (it’s in the OBJECT slot) and then pass that variable as the first argument.