My vfx parent thingy is not working at all

[Nev32]

I am not sure what I am doing wrong, but mine gives me this error:

In my code, here is what I am doing:

Thanks in advance!

[bixarrio]

rockHit is the prefab. You cannot set the transform on a prefab. You must set it on the instantiated object

var instance = Instantiate(rockHit, hitPos, Quaternion.LookRotation(Vector3.up)); // store the instance
instance.transform.parent = parent.transform; // set the transform on the instance