Restoring Over Front page is not allowed

Dear team,

When i want to restore the moodle backup from old moodle to new one it is showing an error like this "Restoring Over Front page is not allowed"

Note: Moodle versions are different 
Old Moodle version:1.9.7
New Moodle Version:2.5.8

can you suggest how can i over come this.

Thanks&Regards

Chandrasekhar Avula