when add/update a faq, post a 500 error

[archonwang]

my enviroment:
Os:cent os 5.4
db:mysql
faq version: 0.3.5

steps as follows:

1. login, faq tab
2. new faq
3. input something and save
   error page 500

I check the log and found something like this

Processing EzfaqController#new (for 192.168.3.74 at 2011-06-29 11:17:31) [GET]
Parameters: {"action"=>"new", "id"=>"dmy", "controller"=>"ezfaq"}
Rendering template within layouts/base
Rendering ezfaq/new
Completed in 67ms (View: 61, DB: 1) | 200 OK [http://192.168.2.135/ezfaq/new/dmy]

Processing EzfaqController#new (for 192.168.3.74 at 2011-06-29 11:17:52) [POST]
Parameters: {"faq"=>{"related_issue_id"=>"", "related_version_id"=>"", "assigned_to_id"=>"", "category_id"=>"", "due_date"=>"", "question"=>"testtext", "related_message_id"=>"", "difficulty"=>"5", "answer"=>"<p align="left">testtext

\r\n

testtext

\r\n"}, "commit"=>"创建", "action"=>"new", "authenticity_token"=>"ej2ZdRbvj4JTADD5LXUHWVD0NS8Kl0YjZhEXKBIGleE=", "id"=>"dmy", "difficulty_label"=>"difficult", "controller"=>"ezfaq", "attachments"=>{"1"=>{"description"=>""}}}

ActionView::MissingTemplate (Missing template faq_mailer/faq_add.text.plain.rhtml in view path app/views):
vendor/plugins/ezfaq_plugin/app/models/faq_mailer.rb:37:in faq_add' vendor/plugins/ezfaq_plugin/app/models/faq_mailer.rb:36:infaq_add'
vendor/plugins/ezfaq_plugin/app/controllers/ezfaq_controller.rb:80:in new' /usr/local/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:inservice'
/usr/local/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in run' /usr/local/ruby/lib/ruby/1.8/webrick/server.rb:173:instart_thread'
/usr/local/ruby/lib/ruby/1.8/webrick/server.rb:162:in start' /usr/local/ruby/lib/ruby/1.8/webrick/server.rb:162:instart_thread'
/usr/local/ruby/lib/ruby/1.8/webrick/server.rb:95:in start' /usr/local/ruby/lib/ruby/1.8/webrick/server.rb:92:ineach'
/usr/local/ruby/lib/ruby/1.8/webrick/server.rb:92:in start' /usr/local/ruby/lib/ruby/1.8/webrick/server.rb:23:instart'
/usr/local/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start'

Rendering /usr/local/redmine-1.2/public/500.html (500 Internal Server Error)