Fix bug.

app/controllers/admin/calendars_controller.rb

@@ -5,7 +5,7 @@ class Admin::CalendarsController < OrbitAdminController
   def index
     @events = []
     tags = @module_app.tags
-    categories = @module_app.categories
+    categories = CalendarType.all
     @filter_fields = {
                         :category=>categories.map{|c| {:title=>(c.title.blank? ? " " : c.title), :id=>c.id}},
                         :tags=>tags.map{|tag| {:title=>(tag.name.blank? ? " " : tag.name), :id=>tag.id}}