Hiki Error

Accept-Charset encoding error (CGI::InvalidEncoding)
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/cgi/core.rb:681:in `block (2 levels) in initialize_query'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/cgi/core.rb:676:in `each'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/cgi/core.rb:676:in `block in initialize_query'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/cgi/core.rb:675:in `each'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/cgi/core.rb:675:in `initialize_query'
/usr/local/rbenv/versions/2.6.5/lib/ruby/2.6.0/cgi/core.rb:859:in `initialize'
/usr/local/hiki/hiki/lib/hiki/request.rb:15:in `new'
/usr/local/hiki/hiki/lib/hiki/request.rb:15:in `initialize'
/usr/local/hiki/hiki/hiki.cgi:21:in `new'
/usr/local/hiki/hiki/hiki.cgi:21:in `<top (required)>'
/home/nay/public_html/hiki.cgi:3:in `load'
/home/nay/public_html/hiki.cgi:3:in `<main>'