This is where the error start
Code:
 rpt.SetDataSource(dt)
it says that:

Failed to load database information.
Error in File temp_f44d34d7-e66c-4e1a-9951-d918ba390949 {3C61418A-CC1B-409E-BECD-D39EF79CAFE4}.rpt:
Failed to load database information.