How to get rid of this error in QTP?

I am new to QTP and trying to resolve the error. I have used the dynamic method of Descriptive programming. When running the below code I get this error:

"The "[ WebButton ]" object's description matches more than one of the objects currently displayed in your application. Add additional properties to the object description in order to uniquely identify the object."

My script is:

Set oDesc=Description.Create()
oDesc("title").value="Google"
Set oDesc1=Description.Create()
oDesc1("name").value="q"
Set oDesc2=Description.Create()
oDesc2("html tag").value="INPUT"
oDesc2("height").value="30"
oDesc2("index:").value="0"

Browser(oDesc).page(oDesc).WebEdit(oDesc1).Set 10
Browser(oDesc).page(oDesc).WebButton(oDesc2).Click

I have used "index" property in order for QTP to uniquely identify the object. Please help.