Collision With Other Instances Of Same Class

Hey so I’m trying to make it so that the instances of the class “Enemy” stop completely when they get too close to each other. They are circles so determining a collision is easy. But when I used this code:


if (Math.sqrt(Math.pow(x-_root.newEnemy.x, 2)+Math.pow(y-_root.newEnemy.y, 2))<=width+3) {
	canMove=false;
}

I get this error message:


TypeError: Error #1010: A term is undefined and has no properties.
	at Enemy/eFrame()

This code works just fine when I test it against the instance of a different class, but it’s not working for some reason. How do I fix this? Thanks (: