When I run the following below in Processing, I get a grey screen. In the previous step of this project, I was able to display the map.png file. 

An error message comes up in the console that says "No row named '-1'" repeatedly. It comes from the Table code here:

// find a row by its name, returns -1 if no row found 

  int getRowIndex(String name) { 

    for (int i = 0; i < rowCount; i++) { 

      if (data[i][0].equals(name)) { 

        return i; 

      } 

    } 

    println("No row named '" + name + "' was found"); 

    return -1; 

  }

but I don't know why it's happening.