Change ckeditor gem and kaminari in gemfile

config/initializers/ckeditor.rb

@@ -0,0 +1,21 @@
+# Use this hook to configure ckeditor
+if Object.const_defined?("Ckeditor")
+  Ckeditor.setup do |config|
+    # ==> ORM configuration
+    # Load and configure the ORM. Supports :active_record (default), :mongo_mapper and
+    # :mongoid (bson_ext recommended) by default. Other ORMs may be
+    # available as additional gems.
+    require "ckeditor/orm/mongoid"
+
+    # Allowed image file types for upload.
+    # Set to nil or [] (empty array) for all file types
+    # config.image_file_types = ["jpg", "jpeg", "png", "gif", "tiff"]
+
+    # Allowed attachment file types for upload.
+    # Set to nil or [] (empty array) for all file types
+    # config.attachment_file_types = ["doc", "docx", "xls", "odt", "ods", "pdf", "rar", "zip", "tar", "swf"]
+
+    # Setup authorization to be run as a before filter
+    # config.authorize_with :cancan
+  end
+end