When sending reports to the screen, what does the message "No database ending in c.00" mean?

This happens if you are trying to send a report to the screen and you forget to select Screen Use Format in the Output Options menu. To send a report to the screen successfully:
Enter New or Old chart data as usual in the Natal Data Entry screen. At the bottom of that screen, type Y at the Change Output Options field. Then in the prompt labeled "Text vers." make sure you select "Screen Use Format." Finish up your input and choose "Start Computation" in the main menu to output the report. The output will then correctly go to the screen without the error message.