The VB IDE is telling you it doesn't know how to start the application.
- Go to the Project properties page.
- Ensure the General tab is selected.
- On the top right, there is a drop down box labeled "Startup Object"
- You should have either a start up form selected, or "Sub Main" selected.
If neither of these options exist, create a form, or open a BAS file and create a Sub Main. This object should then run your report.