Why do I keep getting "cannot find symbol error" in java?

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Java

Java8

First off let me say that I am new to Java and I have researches about this error as it seems it's a common one, but I still haven't found the solution. Here is my code:

public class Test3 {
    
    
    public static void main(String[] args) {
        
        WhiteHouseTour tour = new WhiteHouseTour();
        System.out.println(tour.getRooms( ));
        System.out.println();
        System.out.println(tour);
        
        Visitor v1 = new Visitor("Smirnov, Alex", "M", 35, "Russia");
        Visitor v2 = new Visitor("Smith, Stan", "M", 31, "United States");
        Visitor v3 = new Visitor("Malone, Maggie", "F", 32, "United States");
        Visitor v4 = new Visitor("Zhao, George", "M", 29, "China");
        Visitor v5 = new Visitor("Whiting, Whitney", "F", 32, "Canada");
        

        tour.setVisitor(v1);
        tour.setVisitor(v2);
        tour.setVisitor(v3);
        tour.setVisitor(v4);
        
        //System.out.println(tour);
    }
}

And here is my code from the source file that sets the visitors:

public Visitor[] getVisitors( )
	{
			return visitors;
	}
	
	public void setVisitors(Visitor[] theVisitors)
	{
			visitors = theVisitors;
	}
	
	public int getNumVisitors( )
	{
			return numVisitors;
	}
	
	public void setNumVisitors(int theNumVisitors)
	{
			numVisitors = theNumVisitors;
	}

And the error I am getting is this:

Test3.java:20: error: cannot find symbol
        tour.setVisitor(v1);
            ^
  symbol:   method setVisitor(Visitor)
  location: variable tour of type WhiteHouseTour
Test3.java:21: error: cannot find symbol
        tour.setVisitor(v2);
            ^
  symbol:   method setVisitor(Visitor)
  location: variable tour of type WhiteHouseTour
Test3.java:22: error: cannot find symbol
        tour.setVisitor(v3);
            ^
  symbol:   method setVisitor(Visitor)
  location: variable tour of type WhiteHouseTour
Test3.java:23: error: cannot find symbol
        tour.setVisitor(v4);
            ^
  symbol:   method setVisitor(Visitor)
  location: variable tour of type WhiteHouseTour
4 errors

What I have tried:

I have tried reading on this issue and fixing it myself but so far I haven't been successful. I also tried setting visitors in a different way but that hasn't worked for me either.