Error while using Export Data Store Entity To Excel : Either selection or filters are invalid: The field [XYZ] does not exist. (APNX-1-4505-009)

I am using Export Data Store Entity To Excel smart service to export the data from a table to excel file.

When I export everything from the table it works well, however when I use Selection

= a!querySelection(
  columns: {
      field: pv!exportData.TechSpec,
      alias: "Tech_Spec"
      field: pv!exportData.Preservation_Demand,
      alias: "Preservation_Demand"

I get this error below :

Please help me with it.

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