Plugin Error

Errors in plugins? Retry to Update or Configure.

TypeError
no implicit conversion of nil into String
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/aws/sig_v4.rb:35:in `+'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/aws/sig_v4.rb:35:in `signature'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/aws/pa_api.rb:46:in `get_items'
(plugin/amazon.rb):158:in `rescue in amazon_get'
(plugin/amazon.rb):151:in `amazon_get'
(plugin/amazon.rb):266:in `isbn_detail'
(TDiary::Plugin#eval_src):53:in `eval_src'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/plugin.rb:95:in `eval'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/plugin.rb:95:in `eval_src'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/base.rb:65:in `do_eval_rhtml'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/base.rb:29:in `eval_rhtml'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/view.rb:243:in `eval_rhtml'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/dispatcher/index_main.rb:37:in `run'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/dispatcher/index_main.rb:5:in `run'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/dispatcher.rb:25:in `dispatch_cgi'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/dispatcher.rb:20:in `call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:66:in `block in call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:50:in `each'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:50:in `call'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/rack/valid_request_path.rb:15:in `block in call'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/rack/valid_request_path.rb:14:in `each'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/rack/valid_request_path.rb:14:in `call'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/rack/static.rb:20:in `call'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/rack/html_anchor.rb:19:in `call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:66:in `block in call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:50:in `each'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:50:in `call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:66:in `block in call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:50:in `each'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/urlmap.rb:50:in `call'
/var/lib/gems/2.5.0/gems/tdiary-5.1.0/lib/tdiary/application.rb:52:in `call'
/var/lib/gems/2.5.0/gems/rack-1.6.12/lib/rack/reloader.rb:45:in `call'
/usr/lib/ruby/vendor_ruby/puma/configuration.rb:225:in `call'
/usr/lib/ruby/vendor_ruby/puma/server.rb:658:in `handle_request'
/usr/lib/ruby/vendor_ruby/puma/server.rb:472:in `process_client'
/usr/lib/ruby/vendor_ruby/puma/server.rb:332:in `block in run'
/usr/lib/ruby/vendor_ruby/puma/thread_pool.rb:133:in `block in spawn_thread'