General Error

[CHAMPGARY]

Hello,

I am developing a master-detail report to print purchase order
using data reports and data enviornment.
I have developed the connection,command objects well.
It showing all the listed fields .
But when I add these fields to report and try to run report
It shows me "General Error"

Can anybody explain me what's this error?

Thanks,

[Hack]

What is the exact error message and what is the error message number?