Unable to add email template under transactional emails in magento

Question

Am trying to create new invoice template on magento.When i select template and click load template the template was loading.After that i click save template the following error shoud accred. " SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '0' for key 'PRIMARY', query was: INSERT INTO core_email_template ( template_code , template_text , template_styles , template_type , template_subject , added_at , modified_at , orig_template_code , orig_template_variables ) VALUES (?, ?, ?, ?, ?, '2015-03-20 05:56:15', '2015-03-20 05:56:15', ?, ?) ". What's the problem.Help Me.Thanks in advance.

Answer 1

You might have changed some core files. I suggest you to revert back to the original core files from a clean installation.

Replace all files in app > code > core from a clean installation. Make sure that you get the core files from the same Magento Version as you currently have.