500 Internal Server Error

Insecure operation - gem_original_require (SecurityError)

/usr/local/ruby/2.6/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/usr/local/ruby/2.6/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/home/users/1/chu.jp-ghia/web/chiba/tdiary.rb:225:in `load_plugins'
/home/users/1/chu.jp-ghia/web/chiba/tdiary.rb:260:in `all_filters'
/home/users/1/chu.jp-ghia/web/chiba/tdiary.rb:272:in `referer_filter'
/home/users/1/chu.jp-ghia/web/chiba/tdiary.rb:684:in `initialize'
/home/users/1/chu.jp-ghia/web/chiba/tdiary.rb:948:in `initialize'
/home/users/1/chu.jp-ghia/web/chiba/tdiary/dispatcher/index_main.rb:102:in `new'
/home/users/1/chu.jp-ghia/web/chiba/tdiary/dispatcher/index_main.rb:102:in `create_tdiary'
/home/users/1/chu.jp-ghia/web/chiba/tdiary/dispatcher/index_main.rb:21:in `run'
/home/users/1/chu.jp-ghia/web/chiba/tdiary/dispatcher/index_main.rb:6:in `run'
/home/users/1/chu.jp-ghia/web/chiba/tdiary/dispatcher.rb:21:in `dispatch_cgi'
index.rb:36:in `<main>'