Redmine

I am currently using redmine_meetings plugin in redmine 1.4.7 under ubuntu server.
I have successfully installed the plugin but whenever I try to create a new meeting using redmine_meetings plugin,
it gives Interal Server Error. I looked into the log file and found

ActionView::MissingTemplate (Missing template meeting_mailer/meeting.text.erb in view path

There is a file named meeting.text.erb but I don't know why it is generating an error.