How to use a variable in: <webctrl aaname=VARIABLE />

@hkjobs1988 @aksh1yadav
hey how did you solved it? I am trying to pass a variable into the expression editor. I assigned the selector attribuite to a variable with datatype string. Then I tried calling this variable into Element property of Click. But when I call I am getting error that string cannot be converted to Uielement.

This is my Assign

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this is the property side of Click activity
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Thanx in advance