Hiki Error

Accept-Charset encoding error (CGI::InvalidEncoding)
/usr/local/lib/ruby/3.3.0/cgi/core.rb:693:in `block (2 levels) in initialize_query'
/usr/local/lib/ruby/3.3.0/cgi/core.rb:688:in `each'
/usr/local/lib/ruby/3.3.0/cgi/core.rb:688:in `block in initialize_query'
/usr/local/lib/ruby/3.3.0/cgi/core.rb:687:in `each'
/usr/local/lib/ruby/3.3.0/cgi/core.rb:687:in `initialize_query'
/usr/local/lib/ruby/3.3.0/cgi/core.rb:871:in `initialize'
/home/arton/public_html/hiki/hiki.cgi:43:in `new'
/home/arton/public_html/hiki/hiki.cgi:43:in `<top (required)>'
/home/arton/public_html/collabo/backyard/index.cgi:8:in `load'
/home/arton/public_html/collabo/backyard/index.cgi:8:in `<main>'