can't switch animation

i've been trying to make a small game and i'm trying to switch between animations but no tutorials are working. anyone know how to do this? i'm using 5.6.3 thanks


here's the script i'm using:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class gcanim : MonoBehaviour {

Animator anim;
int jumpHash = Animator.StringToHash("Jump");

// Use this for initialization
void Start () {

anim = GetComponent<Animator>();

}

// Update is called once per frame
void Update () {
float move = Input.GetAxis("Vertical");
anim.SetFloat("walk", move);

if(Input.GetKeyDown(KeyCode.Space))
{
anim.SetTrigger(jumpHash);
}
}
}

my walk and idle animations are called walk and idle (obviously -.-)