Send db mail task fails in SSIS Package with errors related to the parameter

See more:

SQL

SSIS

I am trying to execute this sql task in SSIS package which send an email when the file name is not found. I have declared this user-defined variable "@PackageStartTime" in my ssis package. But when my SSIS package hit this task it fails with following error.

"Executing query DECLARE @PackageStartTime Varchar(250) SET @Packag...." failed with the error.: "Parameter name is unrecognized." Possible failure
reasons: Problem with the query, "ResultSet" Property not set correctly, parameters not set correctly, or connection not established correctly."

DECLARE @PackageStartTime Varchar(250)
  SET @PackageStartTime =?

  IF(SELECT COUNT(*)
  FROM [dbo].[Table1] WHERE RowCDate >=@PackageStartTime)>0

  BEGIN

  DECLARE @SUB Varchar(250)
  SET @SUB = 'File Failed'+@@SERVERNAME

  DECLARE @BODY Varchar(250)
  SET @BODY = 'File Failed'+@@SERVERNAME

  EXEC msdb.dbo.sp_send_dbmail @profile_name='default',
  @recipients='dev@null.com',
  @subject=@SUB,
  @body=@BODY,
  @query= 'SELECT DISTINCT FileLoadName
  FROM [dbo].[Table1] WHERE RowCDate >=@PackageStartTime',
  @attach_query_result_as_file=1

I am unable to understand. I have just added a variable User::strPackageStartTime as Datatype = String and Value is blank. I don't have that variable in parameter mapping in Execute SQL Task Editor. Is there I am missing something?

Thank in advance