E2132 Default property must be an array property (Delphi)

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The default property which you have specified for the class is not an array property. Default properties are required to be array properties.

program Produce;

  type
    Base = class
      function GetV : Char;
      procedure SetV(x : Char);

      property Data : Char read GetV write SetV; default;
    end;

  function Base.GetV : Char;
  begin GetV := 'A';
  end;

  procedure Base.SetV(x : Char);
  begin
  end;

begin
end.

When specifying a default property, you must make sure that it conforms to the array property syntax. The 'Data' property in the above code specifies a 'Char' type rather than an array.

program Solve;

  type
    Base = class
      function GetV(i : Integer) : Char;
      procedure SetV(i : Integer; const x : Char);

      property Data[i : Integer] : Char read GetV write SetV; default;
    end;

  function Base.GetV(i : Integer) : Char;
  begin GetV := 'A';
  end;

  procedure Base.SetV(i : Integer; const x : Char);
  begin
  end;

begin
end.

By changing the specification of the offending property to an array, or by removing the 'default' directive, you can remove this error.