Why isn't the backpack showing up? [SOLVED]

I'm using Roblox Studio and I'm trying to equip a tool, but I realize there isn't a backpack button anymore. I tried enabling the Backpack button with a LocalScript in StarterGui. Still doesn't work.

Could someone please help with my situation?

[SOLVED]

There was a plugin that was disabling the backpack. I deleted the plugin and everything is working again!