Error IS-0009 on my own Plugin to download..

However, while it sorted it self, should I be seeing a simple plugin in this menu? Its sitting at the top above Unreal Engine. Clicking it leads to error

when clicked this happens.

HDRI Browser should not be sitting in menu above, nor should it be trying to open. Its a plugin to be used from inside UE5.

Hope that helps and hope you can fix these bugs and errors.