Sql Reports: I Have Two Data Sets I Want Matching Rows Displayed I Am Using One Report Only Two Views Common Column Is City

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HI,

Sql Reports: I have two data sets i want matching rows displayed i am using one report only two views common column is city
I used lookup =LookupSet(Fields!city.Value, Fields!city.Value, Fields!city.Value, "cityDATASET")

i am getting below error

An occurred during local processing the definition of the report'/Report2' is invalid
The value expression for the textbox 'Textbox2' has a scope parameter that is not valid for a lookup
function.The scope parameter must be set to a string constant that is the name of a dataset

Thanks in advance