Core script issue

I kept getting this core script error not sure if it is an engine bug. Is it possible because of my mistake in my scripts

Usually, adding a task.wait() before calling core-functions helps.
Try that.

i didnt call any core functions, i only set the backpack and leaderboard core function enabled to false ._.

What I meant by that: add a task.wait() before doing so.

Do this in a local script inside “ReplicatedFirst” by the way.