I started receiving this error with the latest version (6.1.50504) of RoyalTS when starting the application. RoyalTS still opens and appears to work.
I haven't seen this particular error message before. You say, Royal TS still opens. Can you confirm that a Chromium based Web Page connection is also working?
I have only seen this 20% or less on time when starting. I am not sure what you mean by "Chromium based web page". I do use Chrome for browsing and not having any issue with it. If it happens again I will try to see else might be running and see if I can gather anything more.
In Royal TS you can configure web pages to be embedded just like RDP or SSH, for example:
If you use one of these with the chromium engine, it probably wouldn't work after you see this error. This is a dedicated chromium engine in Royal TS and has nothing to do with the installed web browser(s).