Visual Studio SSDT System.Security.Permissions.SecurityPermission

Today, I encountered one more error

     Works:            COUNTROWS("DataSet1_WithTextOrNumber")

     Works:            COUNTROWS("DataSet1_WithOnlyOneDateColumn")

     Works:            COUNTROWS("DataSet1")

     Works:            Parameters!FirstDate.Count

     Works:            JOIN(Parameters!FirstDate.Value," & ")

NOT Works:           

a. Select SQL_Col_Date from table1  (Only one date column)

b. Add one more calculated field in report dataset as =Format(Fields!SQL_Col_Date.Value,"Short date")

c. using COUNTROWS("DataSet1_WithOnlyOneDateColumn_CalcColumn") inside an expression ... gives error!

= IIF(COUNTROWS("DataSet1").Equals(Parameters!FirstDate.Count)
,"All",JOIN(Parameters!FirstDate.Value," & "))

[SQL Server as datasource]. Hope microsoft will look into it!

Thanks