Seagate Crystal Reports: Database Error

I am using Crystal reports Version 8 and frequently get the error 'Seagate Crystal Reports: Database Error' when I try to open a previously working crystal report file. The error occurs when I click on the Database menu. Every time I get this error I end up redesigning the report as the I have not yet found a solution and I cant run the report.

The error is a message box with the title 'Seagate Crystal Reports: Database Error' and an ok button - nothing else.

Its very frustrating!

Please help.

Thanks.