Plugin Error

Errors in plugins? Retry to Update or Configure.

ArgumentError
invalid byte sequence in UTF-8
/usr/lib/ruby/1.9.1/erb.rb:912:in `gsub'
/usr/lib/ruby/1.9.1/erb.rb:912:in `html_escape'
(plugin/category.rb):130:in `block (3 levels) in category_list_sections'
(plugin/category.rb):129:in `each'
(plugin/category.rb):129:in `block (2 levels) in category_list_sections'
(plugin/category.rb):127:in `each'
(plugin/category.rb):127:in `block in category_list_sections'
(plugin/category.rb):114:in `each'
(plugin/category.rb):114:in `category_list_sections'
(TDiary::Plugin#eval_src):23:in `block in eval_src'
/mnt/tdiary3/core/tdiary/plugin.rb:99:in `eval'
/mnt/tdiary3/core/tdiary/plugin.rb:99:in `block in eval_src'
/mnt/tdiary3/core/tdiary/core_ext.rb:112:in `block in safe'
/mnt/tdiary3/core/tdiary/core_ext.rb:106:in `call'
/mnt/tdiary3/core/tdiary/core_ext.rb:106:in `safe'
/mnt/tdiary3/core/tdiary/plugin.rb:98:in `eval_src'
/mnt/tdiary3/core/tdiary/base.rb:66:in `do_eval_rhtml'
/mnt/tdiary3/core/tdiary/base.rb:30:in `eval_rhtml'
/mnt/tdiary3/core/tdiary/dispatcher/index_main.rb:43:in `run'
/mnt/tdiary3/core/tdiary/dispatcher/index_main.rb:6:in `run'
/mnt/tdiary3/core/tdiary/dispatcher.rb:26:in `dispatch_cgi'
/home/iron/public_html/index.rb:32:in `<main>'