AS3 error 1061 trying to get collision - actionscript-3

Question

" Player.as, Line 59 1061: Call to a possibly undefined method hitTestObject through a reference with static type Class."
I am new to flash and am trying to make a game, specifically I am trying to make it so the player class in a game can collide with things, I am using a square at the bottom of his feet (not yet referenced in the code) and a MovieClip called collisionTest
package
{
import flash.display.Stage;
import flash.display.MovieClip;
import flash.events.Event;
import KeyObject;
public class Player extends MovieClip
{
public var stageRef:Stage;
public var key:KeyObject;
//add these four variables:
public var leftPressed:Boolean = false; //keeps track of whether the left arrow key is pressed
public var rightPressed:Boolean = false; //same, but for right key pressed
public var upPressed:Boolean = false; //...up key pressed
public var downPressed:Boolean = false; //...down key pressed
private var gravity:Number = 2;
private var runSpeed:Number = 5;
private var touchingGround:Boolean = false;
public var vPressed:Boolean = false;
public function Player(stageRef:Stage, X:int, Y:int):void
{
this.stageRef = stageRef;
this.x = X;
this.y = Y;
key = new KeyObject(stageRef);
addEventListener(Event.ENTER_FRAME, loop, false, 0, true);
}
public function loop(e:Event):void
{
checkKeypresses(); //call "checkKeypresses()" every frame
checkCollisions();
if(leftPressed)
{
x -= runSpeed;
}else if(rightPressed)
{
x += runSpeed;
}
if(upPressed)
{
y -= runSpeed;
}else if(downPressed)
{
y += runSpeed;
}
}
public function checkCollisions():void
{
**(this is line 59)** if(Player.hitTestObject(Player.collisionTest)){
touchingGround = true;
trace("gounded");
}
}
public function checkKeypresses():void
{
// I used http://www.dakmm.com/?p=272 as a reference to get the keyCode numbers for each key
if(key.isDown(37) || key.isDown(65)){ // if left arrow or A is pressed
leftPressed = true;
//trace("left pressed");
} else {
leftPressed = false;
}
if(key.isDown(38) || key.isDown(87)){ // if up arrow or W is pressed
upPressed = true;
//trace("up pressed");
} else {
upPressed = false;
}
if(key.isDown(39) || key.isDown(68)){ //if right arrow or D is pressed
rightPressed = true;
//trace("right pressed");
} else {
rightPressed = false;
}
if(key.isDown(40) || key.isDown(83)){ //if down arrow or S is pressed
downPressed = true;
//trace("down pressed");
} else {
downPressed = false;
}
}
}
}

Answer 1

Function hitTestObject isn't a static function, so you should call it from an object instance, same to the collisionTest.
So it should be
this.hitTestObject(collisionTest);//set collisionTest in the Player class