Why do my animations only play once?

Hello, today was my first time using the animator object. With the script I applied, the model goes through its correct animation once and then freezes in the first frame of that animation. I know as a fact, the "Speed" parameter of the animator object is changed correctly; I see it change whenever I press an input button. For example, when using my Walk animation, the model freezes just after completed a full walk cycle. What am I doing wrong? Does this have something to do with the animations themselves? Thanks in advance!

Here's my code: using UnityEngine; using System.Collections; using System.Collections.Generic;

public class FirstPersonController : MonoBehaviour { public Animator animatorComponent; private HashIDs hashComponent;

 float walkSpeed = 10;
 float gravity = 100;
 private float yRot;    
 private float xRot;    
 public Camera mainCam;
 public CharacterController controller;
 public GameObject characterMesh;
 float deltaVelocity = 0;
 float cameraRotation;
 //The following are for the jumpscript
 bool canJump;
 int xValue;
 public int jumpHeight;
 GameObject player;
 
 void Start() {
     player = GameObject.Find("Player");
     canJump = true;
     animatorComponent = GameObject.FindGameObjectWithTag("PlayerMesh").GetComponent<Animator>();
     hashComponent = GetComponent<HashIDs>();
     animatorComponent.SetLayerWeight(1, 1f);
 }
 
 void Update(){    
     Vector3 vertical = transform.TransformDirection(Vector3.forward);
     Vector3 horizontal = transform.TransformDirection(Vector3.right);    
     Vector3 height = transform.TransformDirection(Vector3.up);
     walkSpeed = 0;//Updates the character's speed

     //basic jumping
     if(Input.GetAxis("Jump") > 0 && canJump) {
         xValue = -1 * jumpHeight;
         StartCoroutine(basicJump());
     }
     
     //Receive Mouse Input        
     if(Input.GetAxis("Mouse X") != 0) {
         yRot = Mathf.SmoothDamp(yRot, yRot + Input.GetAxis("Mouse X"), ref deltaVelocity, .03f);
     }
     
     if(Input.GetAxis("Mouse Y") != 0) {
         xRot -= Input.GetAxis("Mouse Y");
     }
     
     
     Screen.lockCursor = true;//Puts the mouse in the screen's center
     transform.rotation = Quaternion.Euler(0, yRot, 0);        
     //Moves the camera, rotate character
     mainCam.transform.rotation = Quaternion.Euler(xRot, yRot, 0);
     
     controller.Move((height * (-gravity) * Time.deltaTime)/5);
     
     
     if(Input.GetAxis("Vertical") != 0 || Input.GetAxis("Horizontal") != 0) {
         //characterMesh.animation.CrossFade("Run");
         if(Input.GetAxis("Vertical") != 0) {
             walkSpeed = 10 * Input.GetAxis("Vertical");
             controller.Move( (float)(walkSpeed * Time.deltaTime)* vertical);
         }
         if(Input.GetAxis("Horizontal") != 0) {
             walkSpeed = 10 * Input.GetAxis("Horizontal");
             controller.Move( (float)(walkSpeed * Time.deltaTime) * horizontal);
         }
         animatorComponent.SetFloat("Speed", Mathf.Abs(walkSpeed) );
         //Moves the actual character
     } else {
         //characterMesh.animation.CrossFade("Idle");
         //This segment assumes that variable 'walkSpeed' is set to zero
         animatorComponent.SetFloat("Speed", walkSpeed);
     }
 }
 
 IEnumerator basicJump() { //NOTE TO SELF:  REFINE THIS
     canJump = false;
     for(var i = 0; i < jumpHeight; i++) {
         gravity = (-.05f) * (xValue * xValue);
         xValue++;
         yield return new WaitForSeconds(.001f);
     }
     
     
     for(var j = jumpHeight; j > 0; j--) {
         gravity = (.05f) * (xValue * xValue);
         xValue--;
         yield return new WaitForSeconds(.001f);
     }
     
     yield return new WaitForSeconds(.3f);
     canJump = true;
 }

}