Can Someone Please tell me what this means?

Failed to call hook 'OnEntityKill' on plugin 'IOCore v1.0.1' (NullReferenceException: Object reference not set to an instance of an object)

RustEdit extension has an error.

I Uninstalled rust edit last week.... Should I reinstall it?

I mean, pretty sure there is what the error is from, so it would be loaded still if that is the case.

Thank You Wulf!