Getting errors working with String Arrays

[Chrisir]

shorter version

int sessionhs=4355;

String[] lasths;                                                               

void setup() {
  size(333, 180);
  background(0);

  lasths = loadStrings("hs.txt");
}

void draw() {
  background(0);

  text( lasths[0]
    + "\n\npress any key to change high score ", 
    111, 111);
}

//---------------------------------------------------------------------------------------------

void keyPressed() {
  if (sessionhs > int(lasths[0])) {
    lasths[0] = str(sessionhs);
    saveStrings("hs.txt", lasths);  
    println("saved " + lasths[0]);
  }
  sessionhs++;
}
//