Essbase Error 1200400: scalar double argument expected in function

@EQ]

Summary

Essbase Error 1200400: scalar double argument expected in function [@EQ]

Content

HI,

Added the below code to Dynamic calc in Essbase outline. there are no syntax error, but retrieving data in smart view, getting error message as scalar double argument expected

Please let me know is there any other functions required to be added in the below code:its checking for Period 1 in IF statement.

           IF(@LIST(@ILSIBLINGS(@CURRMBR("Fiscal"))) ==0 )

          "Earned Buy $";

           ELSE "Earned Buy $" - @PRIOR("Earned Buy $");

          ENDIF;

Please suggest other options.