Expecting ':' Found '=' Error

I'm getting an error saying "Expecting ':' Found '='"

This is my function I'm getting the error in:

 function Update () 
 {
   horizontalMovement = Vector2(rigidbody.velocity.x, rigidbody.velocity.z);
   if (horizontalMovement.magnitude > maxWalkSpeed) 
   {
       horizontalMovement.Normalize ();
       horizontalMovement *= maxWalkSpeed;
   }
   
   {
   rigidbody.velocity.x = horizontalMovement.x;
   rigidbody.velocity.z = horizontalMovement.y;
   }
   
   if (Input.GetAxis("Horizontal") == 0 && Input.GetAxis("Vertical") == 0)
   {
       rigidbody.velocity.x = Mathf.SmoothDamp(rigidbody.velocity.x, 0, walkDeaccelerationVolx, walkDeacceleration);
       rigidbody.velocity.z = Mathf.SmoothDamp(rigidbody.velocity.z, 0, walkDeaccelerationVolz, walkDeacceleration);
   }
   transform.rotation = Quaternion.Euler(0, cameraObject.GetComponent(FPSMouseLook).currentYRotation, 0);
   rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration, 0, Input.GetAxis("Vertical") * walkAcceleration);
   
   if (Input.GetButtonDown("Jump") && grounded)
       rigidbody.AddForce(0, jumpVelocity, 0);

 }

If you know how to fix this error, Please leave a comment below! Thanks in advance! The Error is on line: 26 Column: 28 -

rigidbody.velocity.x = horizontalMovement.x;

And

rigidbody.velocity.z = horizontalMovement.y;