Using Union in Execute SQL Task

I am using the following SQL statement in an Excute SQL Task:

declare @RespAreaSubAreaID int, @UserLevelID int, @SubmittedByUserID int, @RespAreaID int, @SubAreaID int
Set @RespAreaSubAreaID = ?
Set @SubmittedByUserID = ?
Set @UserLevelID = ?
set @RespAreaID = ?
set @SubAreaID = ?

select users.User_EmailAddress + ';' As CC
                  from users inner join UserLevelsNotificationFrequencys on users.user_Id = UserLevelsNotificationFrequencys.User_id
                  where UserLevelID =  @UserLevelID and RespAreaSubAreaID = @RespAreaSubAreaID and (NotificationFrequencyID = 4 and users.user_id <> @SubmittedByUserID)
            union
            select users.User_EmailAddress + ',' As CC
                  from users inner join UserLevelsNotificationFrequencys on users.user_Id = UserLevelsNotificationFrequencys.User_id
                  where UserLevelID = @UserLevelID and RespAreaSubAreaID = @RespAreaSubAreaID and (NotificationFrequencyID = 1)

 I have my parameter mapped correctly. My results set is set to xml because I want it all in one string to use as a variable named User:CC. On the Result Set tab the result name is 0 and the variable name is User:CC. When I run my package I am getting the error below. Can I not do a union query in the execute SQL task? I tried to not declare anything and just map to each of the variables that I am passing in the order that they are needed but that didn't work either. Thanks in advance for your help in this matter.

 [Execute SQL Task] Error: Executing the query "declare @RespAreaSubAreaID int, @NotificationID in..." failed with the following error: "Syntax error, permission violation, or other nonspecific error". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.

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