FBML Error (line 5): illegal tag “body” under “fb:canvas”

Problem
When trying to use facebooker according to the Developing facebook platform applications with rails book, in the network_test step you are getting the following error:

Solution
It should be caused because you are using the facebooker gem instead of the plugin.
Install the plugin:

using authentication with acts_as_authenticated

Problem
You want to use the easiest authentication method, in order to add users/permissions to your application.

Solution

  1. Install the act_as_authenticated plugin:
  2. Generate controllers, models and migration:
  3. Add necessary user foreign keys in appropriate tables (ie customer in xxx_create_users.rb), plus other fields you may want to use in your user table (ie role):
  4. Run the migration:
  5. Comment out from app/controllers/account_controller.rb the following:
  6. Add it in the app/controllers/application.rb just under the class declaration.
  7. Add in application.rb (same as above) the following just after the session section:
  8. Comment out the default redirection after login and put your own (ie customers): in the account_controller.rb, just before
    the flash[:notice] = “Logged in successfully”.
    Also add the else for the the invalid login:
  9. Change the action in the signup and logout functions in the account_controller.rb file from index to login
  10. Add (optionally) more fields (role) in the signup page (app/views/account/signup.rhtml):
  11. Add restrictions for displaying records depending on user logged in, by using the conditions_for_collection of the activescaffold plugin in app/controllers/customers_controller.rb:
  12. Add a menu page layout in app/views/layouts/_menu.rhtml:
  13. Add the call to the menu partial in the app/views/layouts/application.rhtml, just before the div with id=main :