State machine - using Assets.Code.States; - error CS0246: The type or namespace name `Assets' could not be found.

Hi all, I'm following this book, and using the C# language. I'm on chapter7 where we make a state machine, I've typed all the necessary information it asks me to write. In the Assets folder I got a folder named 'Code', and in Code I got another 2 folders 'Scripts' and 'States'. In the 'Scripts' folder I got a script 'StateManager', and in the 'States' folder I got a script called 'BeginState'. Any response is appreicated.

The full error is - Assets/Code/Scripts/StateManager.cs(2,7): error CS0246: The type or namespace name `Assets' could not be found. Are you missing a using directive or an assembly reference? (StateManager)-

 using UnityEngine;
 using Assets.Code.States;
 
 public class StateManager : MonoBehaviour 
 {
     private BeginState activeState;
 
     void Start () 
     {
         activeState = new BeginState();
         Debug.Log("This object is of type: " + activeState);
     }
 
     void Update () 
     {
 
     }
 }

(BeginState)-

 using UnityEngine;
 
 namespace Asses.Code.States
 {
         public class BeginState
         {
                 public BeginState ()
                 {
             Debug.Log("Constructing BeginState");
                 }
         }
 }