System Error with Ui.loadResource

I got this System Error in an ERA report:

Error Name: System Error
Devices:
vívoactive® 4S: 6.90
App Versions: 1.1.4
Languages: slv

It occurs at an array variable declaration using Ui.loadResource for strings (equivalent to line 3 in the code below):

	function getWeekdays() {
	
		var weekdays = [
			Ui.loadResource(Rez.Strings.Day0),
			Ui.loadResource(Rez.Strings.Day1),
			Ui.loadResource(Rez.Strings.Day2),
			Ui.loadResource(Rez.Strings.Day3),
			Ui.loadResource(Rez.Strings.Day4),
			Ui.loadResource(Rez.Strings.Day5),
			Ui.loadResource(Rez.Strings.Day6)
		];
		
		return weekdays;
	}

My app does not support Slovenian (slv), so it should be using strings for the default language (eng).

Any ideas to address this error?