Unable to analyse the test result

When I ran a QTP script, test result gives failed steps wherever there is sync page.
It says Object does not support this property Browser().Page().sync. This page and browser has been captured in the object repository. This script did not show this failed step when I ran it previous day. Please give suggestion, why is it showing this message and how to take care of it.

Thanks in advance,
Tulip

Try this:

Browser("index:=").Page("micclass:=Page").Sync

or

Browser("micclass:=Browser").Page("micclass:=Page").Sync