Script not sending info to animator

Hi there, I am trying to code some basic walking and running animations on a third-person character. I have set up the animator with a parameter called "state", where a value of zero means play the idle animation, value of 1 means play walk, 2 means play running, 3 should play jumping. However, the script I have only plays the jumping animation successfully. When I move in any direction the character moves but the animations do not play. I have watched the animator while playing and the only time information gets sent to it is when I hold down controls for both vertical and horizontal movement at the same time. In other words, when moving diagonally the animations play. I keep looking at the code and I think the logic is right, and when I debug the if statements they are all working correctly, it's just the the Mek.SetInteger part isn't firing. Code it below, I would love it if anyone could suggest a fix! Thanks.

function Update () {
Debug.Log(walking);
var Mek: Animator = GetComponent(Animator);
// Movement controls
// Can change input settings under Edit > Project Settings > Input
if(Input.GetAxis("Vertical") > 0) {
walking = true;
if(Input.GetButton("Shift")) {
// Use the * Time.deltaTime to convert from speed per frame to speed per second
charController.Move(transform.forward * runSpeed * Time.deltaTime);
state = 2;
Mek.SetInteger("state", 2);

} else {
state = 1;
Mek.SetInteger("state", 1);
charController.Move(transform.forward * walkSpeed * Time.deltaTime);
}
}
else if(Input.GetAxis("Vertical") < 0) {
walking = true;
Mek.SetInteger("state", 1);
if(Input.GetButton("Shift")) {
state = 2;
Mek.SetInteger("state", 2);
charController.Move(transform.forward * -runSpeed * Time.deltaTime);
} else {
state = 1;
Mek.SetInteger("state", 1);
charController.Move(transform.forward * -walkSpeed * Time.deltaTime);
}
} else {
walking = false;
//Mek.SetInteger("state", 0);
}
if(Input.GetAxis("Horizontal") > 0) {
walking = true;
if(Input.GetButton("Shift")) {
state = 2;
Mek.SetInteger("state", 2);
charController.Move(transform.right * runSpeed * Time.deltaTime);
} else {
charController.Move(transform.right * walkSpeed * Time.deltaTime);
}
}
else if(Input.GetAxis("Horizontal") < 0) {
walking = true;
if(Input.GetButton("Shift")) {
charController.Move(transform.right * -runSpeed * Time.deltaTime);
} else {
charController.Move(transform.right * -walkSpeed * Time.deltaTime);
}
} else {
walking = false;
//Mek.SetInteger("state", 0);
}


// Jump control
if (Input.GetButton("Jump") !jumping) {
state = 3;
Mek.SetInteger("state", 3);

startJump();
}
if (jumping) {
charController.Move(transform.up * gravityFall * Time.deltaTime);
gravityFall -= gravity * Time.deltaTime;

if(charController.isGrounded) {
jumping = false;
state = 0;

}
}
if(!walking !jumping !preparingJump) {
Mek.SetInteger("state", 0);
}
// Rotation controls
transform.Rotate(Vector3(0, Input.GetAxis("Mouse X") * rotationSpeed * Time.deltaTime, 0));
}
function startJump() {
preparingJump = true;
yield WaitForSeconds(0.3);
preparingJump = false;
gravityFall = jumpForce;
jumping = true;
}