CinemachineBrain component reference

So i want to disable the CinemachineBrain component on my third person camera whenever i pause for obvious reasons…but i can’t seem to be able to reference it properly…
whenever i try to do this…
else if(uimanager.pauseactive)
healthbarmanager.camsetting = “paused”;
tpcam.GetComponent().enabled = false;
unity throws an error saying “The type or namespace name ‘CinemachineBrain’ could not be found”…is there a special using directive for cinemachine im missing?
Thanks in advance!

using Cinemachine;
private CinemachineBrain brain;

void Start()
        brain = this.gameObject.GetComponent<CinemachineBrain>();
        brain.enabled = false;