Encoding::CompatibilityError in Lag#index

Showing /home/app/webapp/app/views/lag/index.rss.builder where line #42 raised:

incompatible character encodings: ISO-8859-1 and UTF-8
Extracted source (around line #42):
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xml.description article.ingress
xml.tag!("content:encoded") do
xml.cdata!(text2html(article.story_text, article.cloth))
end
xml.pubDate article.created_on.to_s(:rfc822)

Rails.root: /home/app/webapp

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"lag"=>"Sentralt",
 "id"=>"291",
 "format"=>"rss"}

Response

Headers:

None