Crystal Reports 8.5 Error On Database.LogOnServer

I'm trying to support this VB6 and Crystal Reports 8.5 application and am running into an error. When the code does executes .Database.LogOnServer, I get the following error:

Run-time error '-2147192191 (80047281)':

Physical database not found.

Can you tell me what this means? Also, if you can give me help on what each of these parameters I pass into the .Database.LogOnServer method, that'd be great as well.

Thanks in advance.