fix export error

lib/tallty_import_export/export.rb

@@ -67,6 +67,7 @@ module TalltyImportExport
     end
 
     def export_headers
+      binding.pry
       klass.try(:headers) || klass.try(:model_headers)
     end
 

lib/tallty_import_export/exportable.rb

 module TalltyImportExport
   module Exportable
     extend ActiveSupport::Concern
+    include Common
 
     included do |base|
       # base.include(Common)

lib/tallty_import_export/importable.rb

 module TalltyImportExport
   module Importable
     extend ActiveSupport::Concern
+    include Common
 
     included do |base|
       # base.include(Common)