How to enable First Person Controller script for C#?

I disabled the script in the editor and I want to enable the script via another script on the another gameobject. I still can’t get it to work via GetComponent and UnityStandardAssets.Characters.FirstPerson;

You’re enabling the GameObject that the script belongs to, not the actual script itself.

Use controllerScript.enabled = true;

instead of controllerScript.gameObject.SetActive(true);