Issue with CPUParticles2D. | Godot Café | Page 1

I have a CPUParticles2D node, but when I try to reference it in the code, I get the below error:
(I am using the .NET version of Godot)

And here is the part of the code which causes the error:

    public void GameOver()
    {
        var DeathParticles = GetNode<CPUParticles2D>("BurstParticle");
        
        var player = GetNode<playerMovement>("Player");
        
        DeathParticles.Position = player.Position;
        DeathParticles.one_shot = true;
        DeathParticles.emitting = true;
        
        GetNode<Timer>("MobTimer").Stop();
        GetNode<Timer>("ScoreTimer").Stop();
        GetNode<hud>("HUD").ShowGameOver();
        
        GetNode<AudioStreamPlayer>("Music").Stop();
        GetNode<AudioStreamPlayer2D>("DeathSound").Play();
    }

#Issue with CPUParticles2D.