Verify that this objects properties match an object currently displayed

In QTP 8.2 , I see the following error :Run ErrorCannot identify the object "frmInstruments" (of class VbWindow). Verify that this objects properties match an object currently displayed in your application. Properties seems to look ok. Any advice ?

There has to be some property that has different properties now as compared to its properties during record-time. Or, it has some dynamic property(ies). Try to cross-check once again to see if some property has changed or changes during run-time.

here QTP was not find out the property of the object,

i think at the of recording another object is recorded

once you have to check properties of the object match in object repostry or not

if you are missing at laset single colon qtp shows this error