OpenERP email sending issue

Currently I'm working on email sending functionality of openerp version7.0 application. Steps followed : ``` Module 'Email Templates' is installed successfully Navigated to Settings>>Technical>>Email>>Templates Created a new template by selecting my module 'latest_base' Clicked on 'Add context to action button. Clicked on preview button and no errors reported Finally navigated to my module and clicked on send email button. ``` System throws following error. `AttributeError: 'latest_base' object has no attribute 'message_post'`