Error : in Generate Rdlc Report using Windows Form Application

hi Developers,

i am creating a Reporting based windows form application.when i am go to try generate report the Reporting page is throw the following Error. like

An error occured during local report processing.
the Definition of the report 'Main Report ' is invalid.
the Report definition is not valid.
Details : The report definition has an invalid target namespace ' definition' whisch is cannot be upgraded

i am trying lot with google. but i can't get exact output.
iu have no more idea about this module.
so if anyone know this module please help me to i am done this task

thanking you
"Man Becomes What He Thinks About"