how to get values of childItem of a webtable

[caze]

hi everyone ,

i have an issue with WebTable.
one of the cell of my web table has a "WebEdit" object
And my requitment is to read the value of WebEdit object and display it using msgbox.

i tried following:
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Code:

set  a =  Browser("B").Page("P").WebTable("WT:").ChildItem(2, 1, "WebEdit", 0)
b= a.GetROProperty("value")
msgbox b

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when i run this script , I get error message " Object required a"
what must be the problem with above code?

MY OR contains following:

browser-->page-->webedit,webtable