[Baertram]

Could you please post the TOTAL lua files and do not replace any tetx with [...] as the line numbers of the error mesages do not match your code shown here. It's improtant to see the complete code to see what is run in which order and map it to the errors.

Also if you expand the error messages as they show you can see the variable and table contents. It should show you that the variable is NIL already or at least show you the variables that are not nil, containing there values. This way you are able to see yourself, directly in the lua error message, what is missing/wrong content or value.

As RemiCustomAddonIndicator is nil the xml file is either not loaded or loaded after your event_add_on_loaded fires.
Change the load order (but you said you already did?) in your txt file maybe before the lua file.
Maybe your code in the XML file initialization is causing errors you do not see in chat, so try LibDebugLogger for this!
Remove the code in <OnInitialization> of the XML file of the bagspace stuff and try if it works then.