There is an invalid number of result bindings returned for the ResultSetType

Question

SSIS SQL Task:  Single Row Result Set
Code was updated to test for data in target:  If Exists Do Merge  ELSE Do Insert
Previously was just a merge that Output $Action to @ChangeSum and then @ChangeSum queried for updates and inserts
That all worked but after injecting new code I receive the error There is an invalid number of result bindings returned for the ResultSetType that I don't know what it means or how to troubleshoot.
Inject New Code:
IF OBJECT_ID('tempdb..##TblTemp', 'U') IS NOT NULL
DROP TABLE ##TblTemp
Declare @sql nvarchar(max);
set @sql = @TestForData
exec (@sql);
IF EXISTS  (select top 1 * from ##TblTemp)
       Begin
--Beginning of existing code
           begin transaction;
            begin try
            declare @MergeQuery varchar(max)
            set @MergeQuery = convert(varchar(max), @MergeQuery1) +  convert(varchar(max), @MergeQuery2)
            + ' ' + convert(varchar(max), @MergeQuery3)
            + ' ' + convert(varchar(max), @MergeQuery4)
            + ' ' + convert(varchar(max), @MergeQuery5);
            exec(@MergeQuery);
            end try
            begin catch
                declare
                @Message VARCHAR(4000)
                ,@Severity INT
                ,@State  INT;
                select
                @Message = ERROR_MESSAGE()
                ,@Severity = ERROR_SEVERITY()
                ,@State = ERROR_STATE();
                if @@TRANCOUNT > 0
                rollback transaction;
                raiserror(@Message, @Severity, @State);
            end catch;
            if @@trancount > 0
            begin
                commit transaction;
            end
--End of existing code
      End
else
       Begin
    declare @InsertQuery nvarchar(max)
    set @InsertQuery = convert(varchar(max),@InsertQuery1)
    exec (@InsertQuery);
      end
Drop Table ##TblTemp
=================================
SSIS Variable @InsertQuery1:
This variable is executed in SQL Task and the last 3 lines I expect a single row of Insert & Update counts to be returned.
   declare @ChangeSum table(change varchar(25));
   declare @Inserted int = 0;
   declare @Updated int = 0;
While 1 = 1  
    Begin  
        INSERT INTO [R_Paid].[BusCodeF454x93]
        OUTPUT Inserted.Sta3n INTO @ChangeSum
        SELECT TOP 1000 s.*
        FROM [R_Stage].[BusCodeF454x93] s
        WHERE NOT EXISTS
          SELECT 1
            FROM [R_Paid].[BusCodeF454x93]
            WHERE STA3N=S.STA3N and [BusCodeF454x93IEN] = s.[BusCodeF454x93IEN]
       IF @@ROWCOUNT  = 0 BREAK       
END
   set @Inserted = (select count(*) from @ChangeSum );
   set @Updated = 0;
 select @Inserted as Inserted, @Updated as Updated;

Answer 1

"SELECT " + (DT_WSTR,50)@[User::TargetExists] + " = CASE WHEN COUNT(*) > 0 THEN 1 ELSE 0 END
FROM " + (DT_WSTR, 100) @[User::DataDestinationTable]
must do the trick
The T-SQL merge allows both inserts and updates:
MERGE Target AS T
USING Source AS S
ON (T.EmployeeID = S.EmployeeID)
WHEN NOT MATCHED BY TARGET AND S.EmployeeName LIKE 'S%'
THEN INSERT(EmployeeID, EmployeeName) VALUES(S.EmployeeID, S.EmployeeName)
WHEN MATCHED
THEN UPDATE SET T.EmployeeName = S.EmployeeName
WHEN NOT MATCHED BY SOURCE AND T.EmployeeName LIKE 'S%'
THEN DELETE
OUTPUT $action, inserted.*, deleted.*;
ROLLBACK TRAN;
GO
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