Crystal Reports Can't Find Database

I am a little confused, I have my application all setup, Forms, display data as desired, all using SQL Express and an mdf file. Using the connection string in"User Settings"
Now I am moving on to reports, I created my first report with the wizard. When I clicked on the "Main Report Preview" the first time, I got the error
The database table "Properties" cannot be found. Proceed to remove this table from the report? "Yes or No". If I click no to each table the Preview works fine. I can also run my application and select the report from the menu and it displays properly.
Its a little confusing, its using the same database, connection and tables as the rest of my App.
What is the likely culprit so I can avoid it?
Longbow22