Can't Add Script

I cannot add a script to an object It says "Can't add script behaviour CharacterMotor. The script class can't be abstract . Here's the script.

 using UnityEngine;
 using System.Collections;
 
 public abstract class CharacterMotor : MonoBehaviour {
     
     public float maxForwardSpeed = 1.5f;
     public float maxBackwardsSpeed = 1.5f;
     public float maxSidewaysSpeed = 1.5f;
     public float maxVelocityChange = 0.2f;
     
     public float gravity = 10.0f;
     public bool canJump = true;
     public float jumpHeight = 1.0f;
     
     public Vector3 forwardVector = Vector3.forward;
     protected Quaternion alignCorrection;
     
     private bool m_Grounded = false;
     public bool grounded {
         get { return m_Grounded; }
         protected set { m_Grounded = value; }
     }
     
     private bool m_Jumping = false;
     public bool jumping    {
         get { return m_Jumping; }
         protected set { m_Jumping = value; }
     }
     
     private Vector3 m_desiredMovementDirection;
     private Vector3 m_desiredFacingDirection;
     
     void Start () {
         alignCorrection = new Quaternion();
         alignCorrection.SetLookRotation(forwardVector, Vector3.up);
         alignCorrection = Quaternion.Inverse(alignCorrection);
     }
     
     public Vector3 desiredMovementDirection {
         get { return m_desiredMovementDirection; }
         set {
             m_desiredMovementDirection = value;
             if (m_desiredMovementDirection.magnitude>1) m_desiredMovementDirection = m_desiredMovementDirection.normalized;
         }
     }
     public Vector3 desiredFacingDirection {
         get { return m_desiredFacingDirection; }
         set {
             m_desiredFacingDirection = value;
             if (m_desiredFacingDirection.magnitude>1) m_desiredFacingDirection = m_desiredFacingDirection.normalized;
         }
     }
     public Vector3 desiredVelocity {
         get {
             //return m_desiredVelocity;
             if (m_desiredMovementDirection==Vector3.zero) return Vector3.zero;
             else {
                 float zAxisEllipseMultiplier = (m_desiredMovementDirection.z>0 ? maxForwardSpeed : maxBackwardsSpeed) / maxSidewaysSpeed;
                 Vector3 temp = new Vector3(m_desiredMovementDirection.x, 0, m_desiredMovementDirection.z/zAxisEllipseMultiplier).normalized;
                 float length = new Vector3(temp.x, 0, temp.z*zAxisEllipseMultiplier).magnitude * maxSidewaysSpeed;
                 Vector3 velocity = m_desiredMovementDirection * length;
                 return transform.rotation * velocity;
             }
         }
     }
 }