500 Internal Server Error

Accept-Charset encoding error (CGI::InvalidEncoding)

/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/cgi/core.rb:682:in `block (2 levels) in initialize_query'
/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/cgi/core.rb:677:in `each'
/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/cgi/core.rb:677:in `block in initialize_query'
/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/cgi/core.rb:676:in `each'
/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/cgi/core.rb:676:in `initialize_query'
/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/cgi/core.rb:860:in `initialize'
/virtual/n2f/public_html/www.n2f.net/tdiary/index.rb:27:in `new'
/virtual/n2f/public_html/www.n2f.net/tdiary/index.rb:27:in `<top (required)>'
<internal:/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
<internal:/usr/local/rvm/rubies/ruby-3.0.2/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
index.rb:2:in `<main>'