crystalreport error "Exception has been thrown by the target of an invocation"

hi

i have a report form and a datatable in it. when i fill the datatable the error bellow occur:

"Exception has been thrown by the target of an invocation."

my_report report = new my_report();
report.Database.Tables[0].SetDataSource(search_table.DefaultView.ToTable());

i use vs.net 2010 but in vs.net 2008 this code worked well !!!!!

thanks for your attention.