Thank you for your reply, @funkydan2! But version 0.57.2 recently brought the solution. The error was caused by a breaking change, which is mentioned here. So, replacing .Data.Pages with .Site.RegularPages in file rss.xml fixed my issue!
Thank you for your reply, @funkydan2! But version 0.57.2 recently brought the solution. The error was caused by a breaking change, which is mentioned here. So, replacing .Data.Pages with .Site.RegularPages in file rss.xml fixed my issue!