what platform are you using? Windows or Linux?

Hello,

The reporting in Odoo v8 has switched to new technology based on XML called QWeb. Please checck https://doc.odoo.com/trunk/web/qweb/ . In order to modify your reports you can go to Settings -> Reports -> Reports, find your report and modify the XML structure. 

Regards,
Pavel Pavlov
Five Solution

Windows.I download the latest Odoosetup.then its wrkng fine in my windows