Plugin Error

Errors in plugins? Retry to Update or Configure.

ArgumentError
invalid byte sequence in UTF-8
(plugin/amazon.rb):269:in `amazon_get'
(plugin/amazon.rb):381:in `isbn_image'
(TDiary::Plugin#eval_src):212: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/view.rb:240: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/papanda/public_html/index.rb:32:in `<main>'